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Milestones (when did/will we reach the next Billion)

year (estimate/projected) amount years in between
1804 1,000,000,000 -
1927 2,000,000,000 123
1960 3,000,000,000 33
1974 4,000,000,000 14
1987 5,000,000,000 13
1999 6,000,000,000 12
2013 7,000,000,000 14
2028 8,000,000,000 15
2054 9,000,000,000 26
source: United Nations Population Division, "World Population Prospects: The 1998 Revision".