Year	Grams per day
1961	27.66
1962	28.21
1963	24.65
1964	28.89
1965	32.37
1966	32.21
1967	33.81
1968	35.81
1969	32.02
1970	26.09
1971	24.43
1972	20.95
1973	18.57
1974	15.82
1975	15.32
1976	14.73
1977	14.21
1978	12.59
1979	10.91
1980	11.91
1981	8.93
1982	4.96
1983	5.37
1984	6.76
1985	5.99
1986	7.14
1987	5.3
1988	6.26
1989	4.55
1990	6.35
1991	7.56
1992	10.53
1993	4.22
1994	5.54
1995	5.37
1996	10.59
1997	14.41
1998	16.7
1999	18.66
2000	23.04
2001	31.79
2002	51.31
2003	47.68
2004	62.86
2005	48.95
2006	48.12
2007	48.43
2008	56.94
2009	54.07
2010	51.32
2011	49.58
2012	51.02
2013	51.54