Year	Grams per day
1961	27.18
1962	26
1963	15.52
1964	16.4
1965	22.26
1966	23.08
1967	20.59
1968	25.11
1969	26.55
1970	27.06
1971	25.98
1972	27.37
1973	25.53
1974	19.61
1975	18.09
1976	15.66
1977	10.91
1978	9.38
1979	4.96
1980	5.17
1981	2.36
1982	5.1
1983	3.41
1984	7.28
1985	7.05
1986	7.07
1987	20.87
1988	22.31
1989	18.24
1990	16.13
1991	17.17
1992	23.28
1993	22.4
1994	16.96
1995	22.42
1996	13.4
1997	6.07
1998	12
1999	16.19
2000	20.22
2001	19.78
2002	20.07
2003	19.03
2004	22.77
2005	26.01
2006	26.48
2007	27.73
2008	26.13
2009	30.93
2010	35.77
2011	30.38
2012	25.79
2013	40.48