Year	Grams per day
1961	2.69
1962	2.79
1963	2.94
1964	3.09
1965	3.4
1966	3.71
1967	2.64
1968	3.02
1969	4
1970	4.37
1971	3.38
1972	3.43
1973	5.56
1974	4.12
1975	4.64
1976	3.48
1977	4.77
1978	6.97
1979	5.84
1980	2.11
1981	6.92
1982	5.73
1983	4.71
1984	6.03
1985	8.42
1986	12.08
1987	8.09
1988	9.98
1989	8.51
1990	9.88
1991	10.7
1992	11.22
1993	12.93
1994	7.09
1995	9.73
1996	10.83
1997	13.6
1998	12.17
1999	13.5
2000	14.24
2001	13.61
2002	13.26
2003	13.67
2004	13.8
2005	12.9
2006	13.81
2007	13.93
2008	12.72
2009	12.52
2010	11.78
2011	11.92
2012	12.54
2013	12.98