Year	Grams per day
1961	33.79
1962	33.9
1963	33.33
1964	33.4
1965	35.14
1966	37.18
1967	38.69
1968	40.09
1969	42.89
1970	46.2
1971	50.33
1972	49.41
1973	49.83
1974	49.15
1975	42.86
1976	45.89
1977	49.14
1978	50.53
1979	51.47
1980	55.83
1981	51.23
1982	56.17
1983	57.68
1984	54
1985	54.81
1986	55.23
1987	56.93
1988	53.28
1989	49.55
1990	46.43
1991	44.38
1992	40.41
1993	39.65
1994	39.09
1995	38.09
1996	37.03
1997	32.03
1998	36.61
1999	37.11
2000	42.95
2001	45.48
2002	52.63
2003	53.68
2004	58.15
2005	65.34
2006	66.39
2007	63.45
2008	63.77
2009	65.85
2010	65.49
2011	67.37
2012	96.37
2013	96.14