Year	Grams per day
1961	1.83
1962	2.38
1963	1.56
1964	1.68
1965	2.86
1966	5.3
1967	7.35
1968	5.72
1969	8.56
1970	5.82
1971	6.88
1972	7.44
1973	8.49
1974	6
1975	3.72
1976	4.98
1977	4.69
1978	6.82
1979	9.6
1980	7.21
1981	9.74
1982	9.55
1983	9.24
1984	8.92
1985	10.89
1986	12.83
1987	12.52
1988	12.24
1989	9.92
1990	9.57
1991	9.36
1992	9.31
1993	8.85
1994	10.37
1995	10.35
1996	10.51
1997	10.65
1998	10.5
1999	10.77
2000	12.57
2001	17.41
2002	15.85
2003	16.19
2004	17.95
2005	13.54
2006	19.83
2007	21.36
2008	25.64
2009	27.26
2010	27.21
2011	30.87
2012	37.87
2013	34.96