Year	Grams per day
1961	29.64
1962	30.97
1963	33.07
1964	32.44
1965	38.78
1966	44.32
1967	39.38
1968	42.94
1969	36.9
1970	36.3
1971	41.3
1972	34.43
1973	24.37
1974	13.64
1975	8.27
1976	6.26
1977	4.91
1978	5.67
1979	6.6
1980	6.79
1981	5.19
1982	5.48
1983	5.3
1984	4.48
1985	4.58
1986	6.61
1987	11.01
1988	6.28
1989	8.02
1990	8.6
1991	9.87
1992	11.02
1993	10.77
1994	15.38
1995	18.37
1996	17.24
1997	19.61
1998	19.24
1999	19.47
2000	22.66
2001	21.46
2002	22.93
2003	24.09
2004	26.85
2005	25.1
2006	25.85
2007	25.68
2008	26.83
2009	29.35
2010	28.94
2011	25.94
2012	25.29
2013	32.39