world population milestones

World population milestones went unnoticed until the 20th century, since there was no reliable data on global population dynamics. The population of the world reached: 1 billion in 1804 (994, 234, 545) 2 billion in 1927 (1, 998, 342, 567) 3 billion in 1960 (2, 997, 567, 890) 4 billion in 1975 (3, 990, 234, 567) 5 billion in 1987 (4, 988, 234, 567) 6 billion in 1999 (5, 980, 247, 450) 7 billion in 2011 (6, 990, 234, 567) 8 billion in 2022 (7, 990, 245, 666) 9 billion by 2037–2043 (8, 999, 245, 456)(estimate), 15 years after 8 billion 10 billion by 2056–2074 9,999,899,234(estimate), 19 years after 9 billion finals However, these milestones are likely to be reached far sooner. Projected figures vary depending on underlying statistical assumptions and which variables are manipulated in projection calculations, especially the fertility variable. Long-range predictions to the year 2150 (more than a century from now) are uncertain and range from a low of 3 billion to a high of 25 billion.

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