Year	Grams per day
1961	98.14
1962	85.54
1963	97.3
1964	71.69
1965	93.22
1966	79.29
1967	101.96
1968	91.81
1969	68.51
1970	90.44
1971	90.22
1972	95.86
1973	109.47
1974	106.57
1975	100.13
1976	104.04
1977	105.08
1978	98.33
1979	81.46
1980	86.53
1981	85.17
1982	91.94
1983	88.35
1984	84.04
1985	87.74
1986	91.48
1987	84.85
1988	85.63
1989	85.63
1990	83.43
1991	81.66
1992	81.13
1993	79.15
1994	79.75
1995	81.08
1996	75.86
1997	74.96
1998	76.22
1999	73.37
2000	73.16
2001	72.22
2002	73.5
2003	74.59
2004	73.09
2005	73.45
2006	74.72
2007	79.42
2008	82.14
2009	80.57
2010	83.38
2011	84.69
2012	90.61
2013	92.98