Year	Grams per day
1961	40.11
1962	40.37
1963	36.74
1964	39.6
1965	37.39
1966	43.93
1967	43.38
1968	46.62
1969	54.33
1970	54.52
1971	54.19
1972	54.58
1973	39.11
1974	39.78
1975	25.28
1976	25.16
1977	25.86
1978	27.03
1979	29.09
1980	31.29
1981	34.06
1982	35.82
1983	43.33
1984	40.41
1985	40.07
1986	41.6
1987	44.32
1988	43.19
1989	46.03
1990	46.19
1991	48.04
1992	50.59
1993	50.49
1994	51.75
1995	53.61
1996	52.1
1997	54.25
1998	53.25
1999	59.71
2000	65.48
2001	76.17
2002	67.87
2003	70.46
2004	70.96
2005	66.86
2006	61.92
2007	61.03
2008	60.77
2009	60.58
2010	58.01
2011	57.7
2012	56.24
2013	52.89