Year	Grams per day
1961	77.22
1962	79.98
1963	82.59
1964	85.08
1965	87.2
1966	89.34
1967	91.12
1968	92.81
1969	94.29
1970	87.81
1971	88.89
1972	89.7
1973	90.45
1974	87.79
1975	88.75
1976	89.85
1977	90.91
1978	92.01
1979	93.16
1980	94.07
1981	95.04
1982	95.79
1983	96.33
1984	96.41
1985	95.9
1986	94.7
1987	93.14
1988	91.35
1989	91.9
1990	92.6
1991	93.44
1992	94.41
1993	94.55
1994	96.42
1995	93.62
1996	82.09
1997	73.29
1998	67.45
1999	62.63
2000	62.35
2001	61.49
2002	60.75
2003	59.63
2004	59.04
2005	59.74
2006	57.53
2007	51.64
2008	42.89
2009	45.15
2010	46.01
2011	48.11
2012	54.24
2013	55.41