Year	Grams per day
1961	18.97
1962	21.11
1963	18.88
1964	19.34
1965	19.41
1966	20.35
1967	20.31
1968	21.19
1969	21.66
1970	24.76
1971	27.83
1972	30.25
1973	29.11
1974	23.34
1975	17.91
1976	19.08
1977	19.18
1978	22.74
1979	18.23
1980	19.05
1981	17.4
1982	17.48
1983	16.95
1984	17.58
1985	17.45
1986	16.93
1987	13.59
1988	12.79
1989	12.9
1990	12.26
1991	16.98
1992	17.83
1993	16.77
1994	15.43
1995	17.06
1996	22.34
1997	20.12
1998	18.81
1999	22.04
2000	22.04
2001	21.81
2002	21.47
2003	24.45
2004	24.11
2005	26.69
2006	26.26
2007	27.19
2008	26.25
2009	26.84
2010	28.56
2011	29.33
2012	29.81
2013	27.96