Year	Grams per day
1961	68.67
1962	69.98
1963	72.88
1964	76.28
1965	75.01
1966	76.52
1967	78.7
1968	79.12
1969	83.09
1970	84.45
1971	84.78
1972	91.12
1973	96.72
1974	99.22
1975	81.22
1976	89.81
1977	87.67
1978	89.76
1979	93.41
1980	96.14
1981	95.95
1982	87.58
1983	84.71
1984	82.04
1985	77.27
1986	78.74
1987	78.73
1988	78.89
1989	79.71
1990	83.01
1991	84.91
1992	84.49
1993	83.72
1994	82.47
1995	83.24
1996	84.29
1997	88.1
1998	89.07
1999	80.61
2000	84.74
2001	87.43
2002	85.75
2003	85.81
2004	88.06
2005	87.4
2006	81.89
2007	81.32
2008	81.46
2009	81.18
2010	82.28
2011	84.25
2012	86.37
2013	87.99