Year	Grams per day
1961	36.96
1962	37.54
1963	37.54
1964	38.98
1965	34.83
1966	39
1967	38.53
1968	38.59
1969	35.15
1970	41.3
1971	41.22
1972	44.3
1973	47.55
1974	35.13
1975	27.61
1976	42.49
1977	48.25
1978	48.4
1979	45.27
1980	41.18
1981	31.12
1982	30.5
1983	31.37
1984	29.6
1985	34.18
1986	31
1987	30.43
1988	30.6
1989	32.73
1990	43.78
1991	42.68
1992	41.53
1993	42
1994	44.38
1995	42.6
1996	45.52
1997	39.04
1998	36.74
1999	38.94
2000	42.57
2001	48.55
2002	53.18
2003	52.13
2004	56.93
2005	56.91
2006	58.51
2007	59.56
2008	59.23
2009	60.48
2010	62.12
2011	62.53
2012	35.81
2013	50.52