Year	Grams per day
1961	14.38
1962	12.78
1963	13.21
1964	15.48
1965	16.27
1966	16.74
1967	17.41
1968	17.8
1969	14.48
1970	18.81
1971	15.85
1972	14.83
1973	14.45
1974	14.79
1975	14.91
1976	15.72
1977	16.5
1978	17.35
1979	19.39
1980	20.21
1981	16.69
1982	20.17
1983	25.07
1984	23.81
1985	19.72
1986	20.31
1987	20.62
1988	20.75
1989	14.3
1990	10
1991	9.61
1992	10.75
1993	9.12
1994	8.22
1995	8.45
1996	7.24
1997	7.85
1998	8.34
1999	8.9
2000	8.74
2001	8.4
2002	9.46
2003	12.2
2004	15.5
2005	18.63
2006	19.7
2007	20.82
2008	23.36
2009	23.28
2010	24.25
2011	24.8
2012	25.36
2013	24.53