Year	Grams per day
1961	27.55
1962	32.66
1963	35.31
1964	33.94
1965	40.39
1966	42.33
1967	47.32
1968	45.68
1969	46.86
1970	47.58
1971	50.44
1972	45.31
1973	52.85
1974	53.05
1975	56.73
1976	56.8
1977	50.66
1978	43.24
1979	48.55
1980	48.22
1981	55.3
1982	63.55
1983	65.11
1984	62.51
1985	62.54
1986	62.94
1987	60.24
1988	60.54
1989	59.76
1990	57.46
1991	55.87
1992	57.04
1993	56.43
1994	56.64
1995	61.65
1996	64.69
1997	73.46
1998	73.56
1999	74.6
2000	76.53
2001	81.49
2002	83.42
2003	75.01
2004	72.36
2005	67.54
2006	73.09
2007	64.86
2008	61.08
2009	61.08
2010	65.85
2011	68.88
2012	79.04
2013	80.59