Year	Grams per day
1961	11.71
1962	12.14
1963	12.96
1964	13.04
1965	18.25
1966	16.7
1967	21.04
1968	21.21
1969	25.01
1970	25.06
1971	25
1972	24.34
1973	26.28
1974	21.34
1975	19.37
1976	19.47
1977	15.95
1978	14.57
1979	17.97
1980	16.15
1981	17.72
1982	15.33
1983	18.66
1984	19.97
1985	21.13
1986	17.59
1987	18.49
1988	15.59
1989	18.57
1990	13.8
1991	15.8
1992	15.08
1993	16.65
1994	21.35
1995	23.66
1996	23.35
1997	24.99
1998	25.31
1999	30.3
2000	35.72
2001	34.44
2002	33.44
2003	34.94
2004	37.86
2005	31.99
2006	35.85
2007	31.69
2008	31.54
2009	26.8
2010	28.72
2011	27.16
2012	29.17
2013	27.36