Sunday, September 1, 2019

a timeline of the past leading to a TIMELINE OF THE FUTURE(TOTF) TTTF TOTF; A TTTF; A TTTF

YearPRB
(1973–2016)[15]
UN
(2015)[16]
Maddison
(2008)[17]
HYDE
(2010)[18]
Tanton
(1994)[19]
Biraben
(1980)[20]
McEvedy &
Jones (1978)[21]
Thomlinson
(1975)[22]
Durand
(1974)[23]
Clark
(1967)[24]
-100002M[25]4M1–10M
-9000
-80005M5–10M
-7000
-6000
-500018M[25]5M5–20M
-40007M
-300014M
-200027M
-1000115M50M
-200150M
1300M[26]300M231M[27]188M[25]150M255M170M200M270–330M256M[28]
100195M
200202M256M190M
300205M
350254M
400209M206M190M
500210M[25]206M190M
600213M206M200M237M
700226M207M210M
800240M224M220M261M
900269M226M240M
1000310M267M295M[25]254M265M275–345M280M
1100353M301M320M
1200393M400M360M384M
1250400M416M
1300392M300M432M360M400M
1340443M378M
1400390M374M350M
1500500M438M461M[25]460M425M440–540M427M
1600556M554M[25]579M545M498M
1650(<700m class="reference" id="cite_ref-Haub1650_14-1" style="font-size: 10.4px; line-height: 1; unicode-bidi: isolate; white-space: nowrap;" sup="">[14]

545M
500M
516M
1700
603M
603M[25]
600M
679M
610M
600M
641M
1750
791M
814M
770M
720M
700M
735–805M
731M
1800
1,000M
978M
989M[25]
900M
954M
900M
900M
890M
1820
1,042M
1850
1,265M
1,262M
1,263M
1,241M
1,200M
1,200M
1870
1,276M
1875
1,325M
1900
1,656M
1,650M
1,563M
1,654M[25]
1,600M
1,633M
1,625M
1,600M
1,650–1,710M
1,668M
1910
1,750M
1,777M
1913
1,793M
1920
1,860M
1,863M
1,912M
1,968M
1925
2,000M
1930
2,070M
2,092M
2,145M
1940
2,300M
2,299M
2,307M
2,340M

1950 to present[edit]

For times after World War II, demographic data of some accuracy becomes available for a significant number of countries, and population estimates are often given as grand totals of numbers (typically given by country) of widely diverging accuracies. Some sources give these numbers rounded to the nearest million or the nearest thousand, while others give them without any rounding.
Taking these numbers at face value would be false precision; in spite of being stated to four, seven or even ten digits, they should not be interpreted as accurate to more than three digits at best (estimates by the United States Census Bureau and by the United Nations differ by about 0.5–1.5%).
YearUnited States Census Bureau
(2017)[29]
Population Reference Bureau
(1973–2016)[15]
United Nations Department of Economic and Social Affairs
(2015)[16]
Maddison
(2008)[17]
HYDE
(2007)[25]
Tanton
(1994)[19]
Biraben
(1980)[20]
McEvedy &
Jones (1978)[21]
Thomlinson
(1975)[22]
Durand
(1974)[23]
Clark
(1967)[24]
19502,557,628,6542,516,000,0002,525,149,0002,544,000,0002,527,960,0002,400,000,0002,527,000,0002,500,000,0002,400,000,0002,486,000,000
19512,594,939,8772,572,850,9172,571,663,000
19522,636,772,3062,619,292,0682,617,949,000
19532,682,053,3892,665,865,3922,665,959,000
19542,730,228,1042,713,172,0272,716,927,000
19552,782,098,9432,761,650,9812,769,074,000
19562,835,299,6732,811,572,0312,822,502,000
19572,891,349,7172,863,042,7952,879,934,000
19582,948,137,2482,916,030,1672,939,254,000
19593,000,716,5932,970,395,8142,995,909,000
19603,043,001,5083,026,002,9423,041,507,0003,042,000,000
19613,083,966,9293,082,830,2663,082,161,000
19623,140,093,2173,141,071,5313,135,787,0003,036,000,000
19633,209,827,8823,201,178,2773,201,354,000
19643,281,201,3063,263,738,8323,266,477,000
19653,350,425,7933,329,122,4793,333,138,000
19663,420,677,9233,397,475,2473,402,224,0003,288,000,000
19673,490,333,7153,468,521,7243,471,464,000
19683,562,313,8223,541,674,8913,543,086,000
19693,637,159,0503,616,108,7493,615,743,000
19703,712,697,7423,691,172,6163,691,157,0003,710,000,0003,637,000,0003,600,000,0003,600,000,000– 3,700,000,0003,632,000,000
19713,790,326,9483,766,754,3453,769,818,000
19723,866,568,6533,842,873,6113,846,499,000
19733,942,096,4423,919,182,3323,922,793,0003,923,000,0003,860,000,000
19744,016,608,8133,995,304,9223,997,677,000
19754,089,083,2334,071,020,4344,070,671,0003,900,000,0004,000,000,000
19764,160,185,0104,146,135,8504,141,445,000
19774,232,084,5784,220,816,7374,213,539,000
19784,304,105,7534,295,664,8254,286,317,000
19794,379,013,9424,371,527,8714,363,144,000
19804,451,362,7354,449,048,7984,439,529,0004,461,000,000
19814,534,410,1254,528,234,6344,514,838,000
19824,614,566,5614,608,962,4184,587,307,000
19834,695,736,7434,691,559,8404,676,388,000
19844,774,569,3914,776,392,8284,756,521,000
19854,856,462,6994,863,601,5174,837,719,0005,000,000,000
19864,940,571,2324,953,376,7104,920,968,000
19875,027,200,4925,045,315,8715,006,672,000
19885,114,557,1675,138,214,6885,093,306,000
19895,201,440,1105,230,000,0005,180,540,000
19905,288,955,9345,320,816,6675,269,029,0005,308,000,000
19915,371,585,9225,408,908,7245,351,922,000
19925,456,136,2785,494,899,5705,435,722,000
19935,538,268,3165,578,865,1095,518,127,000
19945,618,682,1325,661,086,3465,599,396,000
19955,699,202,9855,760,000,0005,741,822,4125,681,575,000
19965,779,440,5935,821,016,7505,762,212,000
19975,857,972,5435,840,000,0005,898,688,3375,842,122,000
19985,935,213,2485,975,303,6575,921,366,000
19996,012,074,9226,051,478,0105,999,622,000
20006,088,571,3836,067,000,0006,127,700,4286,076,558,0006,145,000,0005,750,000,000
20016,165,219,2476,137,000,0006,204,147,0266,154,791,000
20026,242,016,3486,215,000,0006,280,853,8176,231,704,000
20036,318,590,9566,314,000,0006,357,991,7496,308,364,000
20046,395,699,5096,396,000,0006,435,705,5956,374,056,000
20056,473,044,7326,477,000,0006,514,094,6056,462,987,000
20066,551,263,5346,555,000,0006,593,227,9776,540,214,000
20076,629,913,7596,625,000,0006,673,105,9376,616,689,000
20086,709,049,7806,705,000,0006,753,649,2286,694,832,000
20096,788,214,3946,809,972,0006,834,721,9336,764,086,000
20106,858,584,7556,892,319,0006,916,183,482
20116,935,999,4916,986,951,0006,997,998,760
20127,013,871,3137,057,075,0007,080,072,417
20137,092,128,0947,136,796,0007,162,119,434
20147,169,968,1857,238,184,0007,243,784,000
20157,247,892,7887,336,435,0007,349,472,000
20167,325,996,7097,418,151,841

Projections[edit]

Main article: Projections of population growth

World population estimates from 1800 to 2100, based on "high", "medium" and "low" United Nations projections in 2010 (colored red, orange and green) and US Census Bureau historical estimates (in black). Actual recorded population figures (as of 2010) are colored in blue. According to the highest estimate, the world population may rise to 16 billionby 2100; according to the lowest estimate, it may decline to 6 billion.
As of 2015, the population of the world is projected to reach 8 billion in 2025, and 9 billion by about 2040/42. Kapitza (1996) estimated an asymptotic limit of population growth of 14 billion, 90% of which (12.6 billion) expected to be reached by 2135.[30]
Reasonable predictions of population development are possible for the next 30 years or so, representing the period of fertility of the children alive today. Projections of population reaching more than one generation into the future are highly speculative: Thus, the United Nations Department of Economic and Social Affairs report of 2004 projected the world population to peak at 9.22 billion in 2075 and then stabilise at a value close to 9 billion;[31] By contrast, a 2014 projection by the United Nations Population Division predicts a population close to 11 billion by 2100 without any declining trend in the foreseeable future.[32] On the other hand, a conservative scenario published in 2012 assumes that a maximum of 8 billion will be reached before 2040.[33]
The following table shows projections of world population for the 21st century.
YearUnited States Census Bureau
(2015)[29]
Population Reference Bureau
(1973–2015)[15]
United Nations Department of Economic and Social Affairs
(2015)[16]
20167,334,771,6147,432,663,280
20177,412,778,971
20187,490,427,640
20197,567,402,977
20207,643,402,1237,758,157,000
20217,718,256,830
20227,792,021,317
20237,864,725,370
20247,936,271,554
20258,006,580,5538,000,000,0008,141,661,000
20268,075,716,000
20278,143,729,466
20288,210,559,895
20298,276,190,519
20308,340,606,5908,505,000,0008,500,766,000
20318,403,880,343
20328,466,094,022
20338,527,246,205
20348,587,325,154
20358,646,304,7048,838,908,000
20368,704,239,274
20378,761,189,197
20388,817,138,785
20398,872,066,537
20408,925,949,6799,157,234,000
20418,978,822,945
20429,030,723,366
20439,081,617,002
20449,131,462,326
20459,180,225,2149,453,892,000
20469,227,935,007
20479,274,616,811
20489,320,232,984
20499,364,750,182
20509,408,141,3029,804,000,0009,725,148,000
20559,968,809,000
206010,184,290,000
206510,375,719,000
207010,547,989,000
207510,701,653,000
208010,836,635,000
208510,953,525,000
209011,055,270,000
209511,142,461,000
210011,213,317,000
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