Year	Grams per day
1961	54.6
1962	56.54
1963	55.63
1964	58.13
1965	54.11
1966	51.61
1967	44.02
1968	44.87
1969	40.24
1970	48.23
1971	50.65
1972	54.11
1973	49.94
1974	39.44
1975	46.39
1976	50.87
1977	50.21
1978	40.43
1979	49.04
1980	41.21
1981	46.22
1982	48.8
1983	44.04
1984	46.58
1985	29.59
1986	34.04
1987	31.95
1988	27.84
1989	33.18
1990	44.48
1991	42.2
1992	37.14
1993	37.16
1994	47.89
1995	49.31
1996	48.49
1997	52.59
1998	41.91
1999	39.97
2000	32.18
2001	41.02
2002	35.8
2003	35.91
2004	31.34
2005	32.78
2006	43.92
2007	42.94
2008	37.81
2009	41.95
2010	43.57
2011	43.96
2012	46.13
2013	49.99