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{"type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_016hz245pTpp8TF5y7RSVj16","type":"tool_result","content":"tables: 20\nkeyword: null\nTABLE 0: World population milestones in billions[62] (Worldometers estimates)\nWorld population milestones in billions[62] (Worldometers estimates)\nPopulation\n(in billions)\t1\t2\t3\t4\t5\t6\t7\t8\t9\t10\nYear\t1804\t1927\t1960\t1974\t1987\t1999\t2011\t2022\t2037\t2057\nYears elapsed\t—\t123\t33\t14\t13\t12\t12\t11\t15\t 20 \t—\n\nTABLE 1: Current world population and latest projection according to the UN. Population in (millions) and percent of the global population in that year.[91]\nCurrent world population and latest projection according to the UN. Population in (millions) and percent of the global population in that year.[91]\nRegion\t2022 (percent)\t2030 (percent)\t2050 (percent)\nSub-Saharan Africa\t1,152 (14.51%)\t1,401 (16.46%)\t2,094 (21.62%)\nNorthern Africa and Western Asia\t549 (6.91%)\t617 (7.25%)\t771 (7.96%)\nCentral Asia and Southern Asia\t2,075 (26.13%)\t2,248 (26.41%)\t2,575 (26.58%)\nEastern Asia and Southeastern Asia\t2,342 (29.49%)\t2,372 (27.87%)\t2,317 (23.92%)\nEurope and Northern America\t1,120 (14.10%)\t1,129 (13.26%)\t1,125 (11.61%)\nLatin America and the Caribbean\t658 (8.29%)\t695 (8.17%)\t749 (7.73%)\nAustralia and New Zealand\t31 (0.39%)\t34 (0.40%)\t38 (0.39%)\nOceania\t14 (0.18%)\t15 (0.18%)\t20 (0.21%)\nWorld\t7,942\t8,512\t9,687\n\nTABLE 2: Population by region (2020 estimates)\nPopulation by region (2020 estimates)\nRegion\tDensity\n(inhabitants/km2)\tPopulation\n(millions)\tMost populous country\tMost populous city (metropolitan area)\nAsia\t104.1\t4,641\t1,439,090,595 –  India\t13,515,000 –  Tokyo Metropolis\n(37,400,000 –  Greater Tokyo Area)\nAfrica\t44.4\t1,340\t211,401,000 –  Nigeria\t9,500,000 –  Cairo\n(20,076,000 –  Greater Cairo)\nEurope\t73.4\t747\t146,171,000 –  Russia, approx. 110 million in Europe\t13,200,000 –  Moscow\n(20,004,000 –  Moscow metropolitan area)\nLatin America\t24.1\t653\t214,103,000 –  Brazil\t12,252,000 –  São Paulo City\n(21,650,000 –  São Paulo Metro Area)\nNorthern America[note 1]\t14.9\t368\t332,909,000 –  United States\t8,804,000 –  New York City\n(23,582,649 –  New York metropolitan area[92])\nOceania\t5\t42\t25,917,000 –  Australia\t5,367,000 –  Sydney\nAntarctica\t~0\t0.004[90]\tN/A[note 2]\t1,258 –  McMurdo Station\n\nTABLE 3: Country / Dependency\tPopulation\t% of\nCountry / Dependency\tPopulation\t% of\nworld\tDate\tSource (official or from\nthe United Nations)\n India\t1,425,775,850\t17.3%\t14 Apr 2023\tUN projection[93]\n China\t1,409,670,000\t17.1%\t17 Jan 2024\tNational annual estimate[94]\n United States\t339,137,626\t4.12%\t2 Apr 2026\tNational population clock[95]\n Indonesia\t278,696,200\t3.38%\t1 Jul 2023\tNational annual estimate[96]\n Pakistan\t229,488,994\t2.79%\t1 Jul 2022\tUN projection[97]\n Brazil\t220,502,943\t2.68%\t2 Apr 2026\tNational population clock[98]\n Nigeria\t216,746,934\t2.63%\t1 Jul 2022\tUN projection[97]\n Bangladesh\t168,220,000\t2.04%\t1 Jul 2020\tAnnual Population Estimate[99]\n Russia\t147,190,000\t1.79%\t1 Oct 2021\t2021 preliminary census results[100]\n Mexico\t128,271,248\t1.56%\t31 Mar 2022\n\nTABLE 4: World population (millions, UN estimates)[101]\nWorld population (millions, UN estimates)[101]\n#\tMost populous countries\t2000\t2015\t2030[A]\t\n\nY axis\nX axis\n0\n300\n600\n900\n1200\n1500\n1800\n2000\n2015\n2030\nChina\nIndia\nUnited States\nIndonesia\nPakistan\nBrazil\nNigeria\nBangladesh\nRussia\nMexico\nTen most populous countries\n\n... (4713 chars omitted, 12679 total) ...\n\n2022\t7,975,105,156\t0.83%\t65,810,005\t54\n2023\t8,045,311,447\t0.88%\t70,206,291\t54\n\nTABLE 8: World historical and predicted populations (in millions)[118][63][119]\nWorld historical and predicted populations (in millions)[118][63][119]\nRegion\t1500\t1600\t1700\t1750\t1800\t1850\t1900\t1950\t1999\t2008\t2010\t2012\t2050\t2150\nWorld\t585\t660\t710\t791\t978\t1,262\t1,650\t2,521\t6,008\t6,707\t6,896\t7,052\t9,725\t9,746\nAfrica\t86\t114\t106\t106\t107\t111\t133\t221\t783\t973\t1,022\t1,052\t2,478\t2,308\nAsia\t282\t350\t411\t502\t635\t809\t947\t1,402\t3,700\t4,054\t4,164\t4,250\t5,267\t5,561\nEurope\t168\t170\t178\t190\t203\t276\t408\t547\t675\t732\t738\t740\t734\t517\nLatin America[Note 1]\t40\t20\t10\t16\t24\t38\t74\t167\t508\t577\t590\t603\t784\t912\nNorthern America[Note 1]\t6\t3\t2\t2\t7\t26\t82\t172\t312\t337\t345\t351\t433\t398\nOceania\t3\t3\t3\t2\t2\t2\t6\t13\t30\t34\t37\t38\t57\t51\n\nTABLE 9: World historical and predicted populations by percentage distribution[118][63]","is_error":false}]},"parent_tool_use_id":null,"session_id":"297683e3-037d-47da-a1c9-a1d7195603d8","uuid":"d7d8c90b-7a2f-42ac-b7af-8184f11ca083","timestamp":"2026-04-04T06:03:01.811Z","tool_use_result":{"stdout":"tables: 20\nkeyword: null\nTABLE 0: World population milestones in billions[62] (Worldometers estimates)\nWorld population milestones in billions[62] (Worldometers estimates)\nPopulation\n(in billions)\t1\t2\t3\t4\t5\t6\t7\t8\t9\t10\nYear\t1804\t1927\t1960\t1974\t1987\t1999\t2011\t2022\t2037\t2057\nYears elapsed\t—\t123\t33\t14\t13\t12\t12\t11\t15\t 20 \t—\n\nTABLE 1: Current world population and latest projection according to the UN. Population in (millions) and percent of the global population in that year.[91]\nCurrent world population and latest projection according to the UN. Population in (millions) and percent of the global population in that year.[91]\nRegion\t2022 (percent)\t2030 (percent)\t2050 (percent)\nSub-Saharan Africa\t1,152 (14.51%)\t1,401 (16.46%)\t2,094 (21.62%)\nNorthern Africa and Western Asia\t549 (6.91%)\t617 (7.25%)\t771 (7.96%)\nCentral Asia and Southern Asia\t2,075 (26.13%)\t2,248 (26.41%)\t2,575 (26.58%)\nEastern Asia and Southeastern Asia\t2,342 (29.49%)\t2,372 (27.87%)\t2,317 (23.92%)\nEurope and Northern America\t1,120 (14.10%)\t1,129 (13.26%)\t1,125 (11.61%)\nLatin America and the Caribbean\t658 (8.29%)\t695 (8.17%)\t749 (7.73%)\nAustralia and New Zealand\t31 (0.39%)\t34 (0.40%)\t38 (0.39%)\nOceania\t14 (0.18%)\t15 (0.18%)\t20 (0.21%)\nWorld\t7,942\t8,512\t9,687\n\nTABLE 2: Population by region (2020 estimates)\nPopulation by region (2020 estimates)\nRegion\tDensity\n(inhabitants/km2)\tPopulation\n(millions)\tMost populous country\tMost populous city (metropolitan area)\nAsia\t104.1\t4,641\t1,439,090,595 –  India\t13,515,000 –  Tokyo Metropolis\n(37,400,000 –  Greater Tokyo Area)\nAfrica\t44.4\t1,340\t211,401,000 –  Nigeria\t9,500,000 –  Cairo\n(20,076,000 –  Greater Cairo)\nEurope\t73.4\t747\t146,171,000 –  Russia, approx. 110 million in Europe\t13,200,000 –  Moscow\n(20,004,000 –  Moscow metropolitan area)\nLatin America\t24.1\t653\t214,103,000 –  Brazil\t12,252,000 –  São Paulo City\n(21,650,000 –  São Paulo Metro Area)\nNorthern America[note 1]\t14.9\t368\t332,909,000 –  United States\t8,804,000 –  New York City\n(23,582,649 –  New York metropolitan area[92])\nOceania\t5\t42\t25,917,000 –  Australia\t5,367,000 –  Sydney\nAntarctica\t~0\t0.004[90]\tN/A[note 2]\t1,258 –  McMurdo Station\n\nTABLE 3: Country / Dependency\tPopulation\t% of\nCountry / Dependency\tPopulation\t% of\nworld\tDate\tSource (official or from\nthe United Nations)\n India\t1,425,775,850\t17.3%\t14 Apr 2023\tUN projection[93]\n China\t1,409,670,000\t17.1%\t17 Jan 2024\tNational annual estimate[94]\n United States\t339,137,626\t4.12%\t2 Apr 2026\tNational population clock[95]\n Indonesia\t278,696,200\t3.38%\t1 Jul 2023\tNational annual estimate[96]\n Pakistan\t229,488,994\t2.79%\t1 Jul 2022\tUN projection[97]\n Brazil\t220,502,943\t2.68%\t2 Apr 2026\tNational population clock[98]\n Nigeria\t216,746,934\t2.63%\t1 Jul 2022\tUN projection[97]\n Bangladesh\t168,220,000\t2.04%\t1 Jul 2020\tAnnual Population Estimate[99]\n Russia\t147,190,000\t1.79%\t1 Oct 2021\t2021 preliminary census results[100]\n Mexico\t128,271,248\t1.56%\t31 Mar 2022\n\nTABLE 4: World population (millions, UN estimates)[101]\nWorld population (millions, UN estimates)[101]\n#\tMost populous countries\t2000\t2015\t2030[A]\t\n\nY axis\nX axis\n0\n300\n600\n900\n1200\n1500\n1800\n2000\n2015\n2030\nChina\nIndia\nUnited States\nIndonesia\nPakistan\nBrazil\nNigeria\nBangladesh\nRussia\nMexico\nTen most populous countries\n\n... (4713 chars omitted, 12679 total) ...\n\n2022\t7,975,105,156\t0.83%\t65,810,005\t54\n2023\t8,045,311,447\t0.88%\t70,206,291\t54\n\nTABLE 8: World historical and predicted populations (in millions)[118][63][119]\nWorld historical and predicted populations (in millions)[118][63][119]\nRegion\t1500\t1600\t1700\t1750\t1800\t1850\t1900\t1950\t1999\t2008\t2010\t2012\t2050\t2150\nWorld\t585\t660\t710\t791\t978\t1,262\t1,650\t2,521\t6,008\t6,707\t6,896\t7,052\t9,725\t9,746\nAfrica\t86\t114\t106\t106\t107\t111\t133\t221\t783\t973\t1,022\t1,052\t2,478\t2,308\nAsia\t282\t350\t411\t502\t635\t809\t947\t1,402\t3,700\t4,054\t4,164\t4,250\t5,267\t5,561\nEurope\t168\t170\t178\t190\t203\t276\t408\t547\t675\t732\t738\t740\t734\t517\nLatin America[Note 1]\t40\t20\t10\t16\t24\t38\t74\t167\t508\t577\t590\t603\t784\t912\nNorthern America[Note 1]\t6\t3\t2\t2\t7\t26\t82\t172\t312\t337\t345\t351\t433\t398\nOceania\t3\t3\t3\t2\t2\t2\t6\t13\t30\t34\t37\t38\t57\t51\n\nTABLE 9: World historical and predicted populations by percentage distribution[118][63]","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false}}
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{"type":"result","subtype":"success","is_error":false,"duration_ms":9356,"duration_api_ms":7324,"num_turns":2,"result":"Here are the years when world population reached each billion milestone, from **Table 0** of the article (Worldometers estimates):\n\n| Billion | Year |\n|---------|------|\n| 1 billion | **1804** |\n| 2 billion | **1927** |\n| 3 billion | **1960** |\n| 4 billion | **1974** |\n| 5 billion | **1987** |\n| 6 billion | **1999** |\n| 7 billion | **2011** |\n| 8 billion | **2022** |\n\nNotable observations: it took 123 years to go from 1→2 billion, but the pace accelerated dramatically — only 11–14 years between each milestone from the 4th billion onward.","stop_reason":"end_turn","session_id":"297683e3-037d-47da-a1c9-a1d7195603d8","total_cost_usd":0.048489,"usage":{"input_tokens":3,"cache_creation_input_tokens":9604,"cache_read_input_tokens":24950,"output_tokens":332,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":9604,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"},"modelUsage":{"claude-sonnet-4-6":{"inputTokens":3,"outputTokens":332,"cacheReadInputTokens":24950,"cacheCreationInputTokens":9604,"webSearchRequests":0,"costUSD":0.048489,"contextWindow":200000,"maxOutputTokens":32000}},"permission_denials":[],"fast_mode_state":"off","uuid":"67542abd-ccda-4864-9c2c-1d3a845894bc"}
