Year	Grams per day
1961	25.18
1962	30.64
1963	33.61
1964	29.49
1965	29.47
1966	28.85
1967	29.43
1968	34.47
1969	29.96
1970	35.92
1971	37.92
1972	36.02
1973	35.74
1974	34.61
1975	29.88
1976	41.7
1977	42.55
1978	42.59
1979	42.26
1980	41.71
1981	33.67
1982	31.99
1983	29.14
1984	28.26
1985	29.33
1986	29.18
1987	28.51
1988	27.99
1989	31.67
1990	32.56
1991	31.51
1992	28.52
1993	25.3
1994	20.77
1995	23.54
1996	26.1
1997	31.71
1998	29.15
1999	34.9
2000	26.46
2001	29.39
2002	36.26
2003	41.49
2004	39.3
2005	37.08
2006	38.25
2007	39.55
2008	44.14
2009	40.17
2010	38.92
2011	40.12
2012	42.68
2013	44.69