Year	Grams per day
1961	28.9
1962	31.33
1963	28.03
1964	28.09
1965	39.35
1966	41.95
1967	42.55
1968	48.95
1969	45.23
1970	46.7
1971	39.13
1972	38.58
1973	38.42
1974	36.05
1975	38.13
1976	38.56
1977	45.76
1978	48.34
1979	48.84
1980	50.51
1981	49.83
1982	51.83
1983	59.16
1984	66.8
1985	66.02
1986	65.72
1987	76.48
1988	78.8
1989	60.05
1990	59.29
1991	56.54
1992	57.23
1993	56.38
1994	56.24
1995	55.13
1996	63.24
1997	65.71
1998	65.53
1999	63.35
2000	64.79
2001	65.86
2002	66.77
2003	70.33
2004	69.52
2005	70
2006	73.07
2007	74.27
2008	73.61
2009	74.72
2010	78.57
2011	81.43
2012	79.77
2013	77.93