Year	Grams per day
1961	44.98
1962	46.97
1963	45.25
1964	46.69
1965	43.69
1966	45.07
1967	47.28
1968	48.06
1969	45.77
1970	41.11
1971	50.43
1972	47.97
1973	45.37
1974	48.74
1975	59.96
1976	64.31
1977	69.14
1978	69.34
1979	79.6
1980	80.38
1981	79.25
1982	73.33
1983	79.4
1984	79.03
1985	78.68
1986	82.85
1987	89.91
1988	76.17
1989	81.76
1990	79.24
1991	76.11
1992	72.09
1993	74.32
1994	71.15
1995	70.59
1996	71.9
1997	76.33
1998	52.39
1999	58.92
2000	78.63
2001	77.44
2002	80.48
2003	82.84
2004	84.33
2005	75.51
2006	77.88
2007	86.74
2008	78.45
2009	85.29
2010	85.59
2011	74.91
2012	82.83
2013	78.22