Year	Grams per day
1961	56.17
1962	67.38
1963	83.04
1964	72.6
1965	80.89
1966	89.8
1967	91.15
1968	84.3
1969	95.06
1970	93.86
1971	85.48
1972	80.72
1973	79.82
1974	82.2
1975	77.29
1976	80.46
1977	93.22
1978	90.45
1979	91.51
1980	87.77
1981	90.44
1982	86.63
1983	81.81
1984	85.53
1985	78.31
1986	84.58
1987	92.34
1988	76.66
1989	85.34
1990	79.41
1991	77.77
1992	74.9
1993	75.92
1994	76.87
1995	82.59
1996	83.58
1997	79.41
1998	71
1999	70.82
2000	77.57
2001	80.11
2002	73.99
2003	71.14
2004	78.34
2005	82.35
2006	82.76
2007	81.6
2008	79.66
2009	75.59
2010	81.61
2011	71.59
2012	76.25
2013	76.03