Year	Grams per day
1961	65.03
1962	66.9
1963	64.93
1964	67.07
1965	64.71
1966	61.96
1967	61.86
1968	62.76
1969	62.43
1970	63.1
1971	63.6
1972	64.7
1973	67.76
1974	66.97
1975	66.28
1976	68.38
1977	67.86
1978	69.81
1979	72.86
1980	69.44
1981	65.97
1982	65.12
1983	68.44
1984	57.41
1985	51.53
1986	47.2
1987	42.36
1988	40.14
1989	43.22
1990	45.02
1991	52.63
1992	50.44
1993	45.26
1994	43.59
1995	55.96
1996	51.71
1997	50.85
1998	53.37
1999	65.63
2000	60.09
2001	60.94
2002	63.85
2003	58.58
2004	60.79
2005	60.12
2006	60.28
2007	59.71
2008	58.66
2009	56.61
2010	47.91
2011	49.45
2012	51.05
2013	45.78