Year	Grams per day
1961	52.53
1962	50.26
1963	50.01
1964	50.43
1965	53.11
1966	52.39
1967	46.57
1968	44.2
1969	50.33
1970	53.19
1971	56.11
1972	51.55
1973	49.22
1974	53.66
1975	51.16
1976	52.27
1977	53.31
1978	58.2
1979	57.28
1980	52.22
1981	53.99
1982	53.19
1983	55.28
1984	65.94
1985	64.17
1986	56.93
1987	49.02
1988	49
1989	54.83
1990	56
1991	57.34
1992	58.05
1993	51.89
1994	57.3
1995	57.91
1996	56.94
1997	62.31
1998	62.89
1999	62.32
2000	63.69
2001	64.07
2002	62.94
2003	66.22
2004	54.72
2005	54.16
2006	55.14
2007	56.19
2008	62.17
2009	62.35
2010	59.93
2011	60.88
2012	63.65
2013	64.19