Year	Grams per day
1961	30.95
1962	33.76
1963	36.48
1964	35.8
1965	38.3
1966	36.29
1967	36.19
1968	36.36
1969	36.23
1970	36.07
1971	35.88
1972	36.84
1973	35.8
1974	36.25
1975	53.27
1976	59.02
1977	59.3
1978	63.44
1979	53.66
1980	56.09
1981	56.9
1982	60.76
1983	53
1984	51.83
1985	39.48
1986	42.93
1987	44.98
1988	44.42
1989	45.79
1990	46.85
1991	45.98
1992	46.89
1993	45.98
1994	45.12
1995	44.38
1996	42.84
1997	42.67
1998	42.42
1999	42.97
2000	42.98
2001	43.35
2002	44.74
2003	47.62
2004	46.63
2005	45.59
2006	46.76
2007	47.21
2008	46.79
2009	47.18
2010	46.87
2011	46.39
2012	48.96
2013	45.47