Year Total (Mill. tons) Per Capita (kilograms)
1950 14 5.5
1955 18 6.5
1960 27 8.9
1965 40 12.0
1970 66 17.8
1975 82 20.1
1980 112 25.1
1990 143 27.0
1994 (prel) 121 21.6
*Source: Brown, Lester R. Nicholas Lenssen, and Hal Kane. 1995. Vital Signs: The Trends That Are Shaping Our Future 1995-1996. The WorldWatch Institute. P. 27.