FAO stats on calorie availability per capita
Global calorie availability per capita Year 1970 1980 1990 2000 2007 Kcal/capita/day 2393 2491 2630 2725 2796
Source: Food and Agricultural Organization of the United Nations (FAO), “Food Supply Balance Sheets,” FAOSTAT, http://faostat.fao.org/site/368/DesktopDefault.aspx?PageID=368#ancor