Year	Grams per day
1961	63.89
1962	62.8
1963	63.82
1964	66.7
1965	68.79
1966	74.27
1967	70.72
1968	68.66
1969	66.36
1970	66.73
1971	68.45
1972	70.26
1973	77.24
1974	76.6
1975	88.08
1976	89.68
1977	87.39
1978	87.98
1979	87.91
1980	81.5
1981	74.99
1982	65.94
1983	62.92
1984	75.66
1985	75.59
1986	72.59
1987	69.78
1988	64.25
1989	70.06
1990	71.59
1991	73.68
1992	75.85
1993	76.57
1994	77.96
1995	73.59
1996	72.83
1997	72.77
1998	72.69
1999	73.02
2000	72.64
2001	72.62
2002	72.88
2003	72.98
2004	74.5
2005	75.32
2006	77.19
2007	76.31
2008	75.18
2009	77.01
2010	81.19
2011	80.06
2012	79.58
2013	79.76