Year	Grams per day
1961	56.26
1962	64.21
1963	57.43
1964	62.87
1965	63.32
1966	67.54
1967	78.32
1968	73.24
1969	75.17
1970	79.76
1971	80.96
1972	80.55
1973	81.4
1974	88.51
1975	81.57
1976	91.53
1977	90.24
1978	90.58
1979	95.79
1980	83.68
1981	83.41
1982	83.8
1983	78.97
1984	70.89
1985	78.17
1986	73.26
1987	75.68
1988	74.58
1989	73.57
1990	76.13
1991	75.55
1992	79.12
1993	77.84
1994	80.02
1995	80.4
1996	80.48
1997	80.76
1998	81.54
1999	81.4
2000	81.01
2001	81.72
2002	81.48
2003	81.71
2004	81.91
2005	81.94
2006	82.85
2007	81.67
2008	82.8
2009	82.91
2010	83.24
2011	85.21
2012	85.49
2013	85.59