Year	Grams per day
1961	58.79
1962	58.21
1963	63.84
1964	58.25
1965	72.16
1966	68.54
1967	72.84
1968	72.58
1969	72.34
1970	71.02
1971	74.44
1972	78.14
1973	79.93
1974	80.98
1975	86.37
1976	97.71
1977	94.79
1978	100.36
1979	96.61
1980	100.83
1981	98.35
1982	103.59
1983	101.12
1984	96.63
1985	96.64
1986	95.85
1987	98.24
1988	105.71
1989	100.23
1990	99.4
1991	102.55
1992	100.45
1993	102.14
1994	92.66
1995	97.77
1996	106.04
1997	115.34
1998	117.97
1999	115.56
2000	115.11
2001	111.88
2002	108.38
2003	105
2004	103.49
2005	109.34
2006	115.84
2007	113.22
2008	112.05
2009	111.6
2010	108.25
2011	112.36
2012	112.93
2013	112.62