Year	Grams per day
1961	55.22
1962	54.92
1963	54.6
1964	54.04
1965	63.11
1966	62.82
1967	64.31
1968	57.06
1969	52.42
1970	48.52
1971	42.66
1972	44.12
1973	47.25
1974	50.28
1975	36.64
1976	46.01
1977	51.04
1978	52.9
1979	52.03
1980	48.88
1981	51.26
1982	54.19
1983	59.19
1984	55.47
1985	57.53
1986	64.75
1987	66.45
1988	75.83
1989	78.18
1990	75.8
1991	77.08
1992	64.33
1993	79.14
1994	66.62
1995	87.57
1996	80.11
1997	81.51
1998	87.55
1999	89.7
2000	112.77
2001	111.61
2002	100.36
2003	92.18
2004	94
2005	88.67
2006	89.67
2007	104.54
2008	98.29
2009	98.27
2010	97.58
2011	98.02
2012	94.83
2013	99.16