Year	Grams per day
1961	18.22
1962	17.85
1963	27.31
1964	29.95
1965	32.35
1966	33.08
1967	32.84
1968	37.12
1969	40.85
1970	45.49
1971	47.25
1972	51.11
1973	35.11
1974	39.17
1975	44.56
1976	45.3
1977	30.97
1978	46.89
1979	61.38
1980	112.53
1981	114.53
1982	104.59
1983	87.27
1984	82.97
1985	75.26
1986	71.46
1987	74.82
1988	76.25
1989	75.89
1990	74.32
1991	75.23
1992	77.69
1993	75.97
1994	74.49
1995	77.01
1996	78.68
1997	79.9
1998	79.41
1999	81.61
2000	83.96
2001	84.63
2002	84.22
2003	85.59
2004	84.59
2005	88.62
2006	89.43
2007	87.85
2008	88.76
2009	92.2
2010	90.73
2011	88.78
2012	87.99
2013	86.84