Net per capita food supply increased by 31% from 1961 to 2011
Food Balance, Food Balance Sheets, Country: World, Years: 2011 and 1961, Per Capita Supply, Kcal / Day; accessed February 24, 2015, http://faostat3.fao.org/download/FB/FBS/E.
Calculation: 1961 = 2193 kcal 2011 = 2868 kcal %change: (2868 - 2193) / 2193 = 0.307 x 100 = 30.7%