Year	Grams per day
1961	22.76
1962	23.13
1963	20.92
1964	20.03
1965	23.89
1966	25.67
1967	25.42
1968	24.85
1969	27.72
1970	27.1
1971	28.33
1972	27.26
1973	25.15
1974	19.38
1975	18.38
1976	20.17
1977	19.44
1978	19.69
1979	22.11
1980	19.13
1981	18.36
1982	20.05
1983	16.11
1984	14.83
1985	15.8
1986	13.52
1987	14.22
1988	15.38
1989	13.57
1990	13.38
1991	14.12
1992	14.35
1993	14.5
1994	14.07
1995	12.19
1996	10.44
1997	9.5
1998	14.68
1999	14.14
2000	14.14
2001	13.53
2002	13.77
2003	15.66
2004	14.95
2005	14.64
2006	18.46
2007	18.35
2008	18.28
2009	18.26
2010	10.39
2011	15.59
2012	14.6
2013	16.5