Year	Grams per day
1961	53.34
1962	55.32
1963	55.12
1964	56.47
1965	61.48
1966	64.08
1967	67.14
1968	68.75
1969	71.72
1970	76.08
1971	80.64
1972	78.87
1973	70.12
1974	68.33
1975	69.43
1976	78.17
1977	87.65
1978	91.56
1979	101.54
1980	85.8
1981	81.83
1982	88.44
1983	80.09
1984	79.18
1985	71.21
1986	74.26
1987	74.42
1988	76
1989	75.79
1990	81.06
1991	73.23
1992	76.33
1993	77.49
1994	76.74
1995	76.35
1996	75.57
1997	74.95
1998	73.81
1999	73.78
2000	76.01
2001	77
2002	75.87
2003	74.88
2004	74.59
2005	74.34
2006	71.29
2007	70.4
2008	71.2
2009	69.8
2010	70.6
2011	73.06
2012	72.78
2013	75.19