Year	Grams per day
1961	87.39
1962	91.33
1963	94.17
1964	98.57
1965	104.03
1966	107.74
1967	111.66
1968	114
1969	114.6
1970	117.9
1971	119.8
1972	117.61
1973	123.9
1974	122.72
1975	123.63
1976	126.8
1977	128.51
1978	129.39
1979	127.12
1980	134.08
1981	134.34
1982	134.43
1983	133.58
1984	133.85
1985	127.52
1986	132.82
1987	142.49
1988	141.41
1989	128.12
1990	135.15
1991	99.34