Year	Grams per day
1961	41.87
1962	41.57
1963	38.69
1964	43.81
1965	50.52
1966	56.86
1967	57.91
1968	57.81
1969	54.16
1970	60.59
1971	66.98
1972	68.47
1973	79.96
1974	82.73
1975	78.81
1976	84.99
1977	87.32
1978	90.41
1979	93.5
1980	73.53
1981	87.95
1982	89.18
1983	89.81
1984	93.03
1985	95.66
1986	95.11
1987	96.95
1988	94.83
1989	100.96
1990	87.29
1991	84.08
1992	89.04
1993	84.4
1994	86.59
1995	85.88
1996	83.63
1997	74.35
1998	87.08
1999	88.48
2000	90.39
2001	94.43
2002	94.18
2003	96.19
2004	100.01
2005	93.16
2006	78.33
2007	86.02
2008	85.14
2009	75.71
2010	77.29
2011	75.12
2012	81.24
2013	80.29