UNEP World Population in thousands from http://esa.un.org/unpp/ Year Low Mediem High 1950 2.518629 2.518629 2.518629 1955 2.755823 2.755823 2.755823 1960 3.021475 3.021475 3.021475 1965 3.334874 3.334874 3.334874 1970 3.692492 3.692492 3.692492 1975 4.068109 4.068109 4.068109 1980 4.434682 4.434682 4.434682 1985 4.830979 4.830979 4.830979 1990 5.263593 5.263593 5.263593 1995 5.67438 5.67438 5.67438 2000 6.070581 6.070581 6.070581 2005 6.403651 6.453628 6.501617 2010 6.688557 6.830283 6.966491 2015 6.939483 7.197247 7.446772 2020 7.159031 7.540237 7.912776 2025 7.334237 7.851455 8.364838 2030 7.454422 8.130149 8.81759 2035 7.518174 8.378184 9.278887 2040 7.529259 8.593591 9.740745 2045 7.492193 8.774394 10.193284 2050 7.408573 8.918724 10.633442