Year	Grams per day
1961	38.74
1962	37.4
1963	44.83
1964	44.8
1965	47.14
1966	48.2
1967	54.47
1968	56.31
1969	54.54
1970	50.18
1971	53.11
1972	55.43
1973	58.08
1974	66.79
1975	60.67
1976	58.21
1977	64.44
1978	70.45
1979	71.31
1980	71.64
1981	65.38
1982	60.09
1983	65.83
1984	67.82
1985	69.05
1986	59.54
1987	72.34
1988	60.91
1989	71.84
1990	74.75
1991	71.24
1992	73.83
1993	76.4
1994	78.97
1995	76.63
1996	85.81
1997	77.88
1998	75.23
1999	75.88
2000	78.6
2001	73.04
2002	74.51
2003	76.28
2004	75.91
2005	70.14
2006	67.46
2007	68.16
2008	70.6
2009	62.73
2010	63.33
2011	65.69
2012	68.11
2013	64.56