Year	Grams per day
1961	54.48
1962	52.09
1963	57.5
1964	62.54
1965	74.74
1966	76.94
1967	78.01
1968	76.69
1969	79.42
1970	84.3
1971	85.73
1972	87.09
1973	87.97
1974	98.52
1975	98.7
1976	100.19
1977	99.66
1978	98.11
1979	94.43
1980	107.09
1981	106.43
1982	104.85
1983	101.95
1984	98.59
1985	109.08
1986	110.18
1987	109.63
1988	108.54
1989	120.37
1990	119.71
1991	97.26