Year Total Production (mill. tons) Per Capita (kilograms)
1950 44 17.2
1955 58 20.7
1960 64 21.0
1965 81 24.2
1970 97 26.2
1975 109 26.9
1980 130 29.1
1985 146 30.1
1990 171 32.4
1994 (prel) 184 32.7
*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. 31