Year	Grams per day
1961	38.14
1962	41.92
1963	43.08
1964	50.09
1965	54.07
1966	58.84
1967	43.65
1968	48.15
1969	49.98
1970	55.19
1971	52.48
1972	55.47
1973	57.72
1974	56.72
1975	50.12
1976	57.22
1977	58.8
1978	59.82
1979	58.14
1980	59.23
1981	60.79
1982	62.11
1983	62.74
1984	61.03
1985	64.26
1986	80.04
1987	62.86
1988	66.17
1989	64.9
1990	60.15
1991	60.68
1992	62.34
1993	66.28
1994	69.11
1995	69.61
1996	68.59
1997	66.92
1998	66.84
1999	73.27
2000	67.89
2001	67.48
2002	68.08
2003	71.18
2004	68.59
2005	69.66
2006	69.47
2007	68.58
2008	70.04
2009	70.56
2010	70.66
2011	71.55
2012	70.7
2013	69.56