Year	Grams per day
1961	8.21
1962	13.28
1963	28.6
1964	52.66
1965	53.82
1966	52.27
1967	50.8
1968	48.14
1969	45.59
1970	33.79
1971	36.21
1972	41.29
1973	45.86
1974	38.96
1975	39.27
1976	39.19
1977	53.41
1978	53.87
1979	54.32
1980	63.47
1981	57.61
1982	62.01
1983	55.59
1984	56.55
1985	52.73
1986	63.35
1987	58.63
1988	60.87
1989	60.94
1990	64.95
1991	48.48
1992	28.97
1993	34.88
1994	32.65
1995	27.24
1996	28.04
1997	31.31
1998	30.18
1999	25.86
2000	33.21
2001	36.04
2002	32.2
2003	32.34
2004	33.31
2005	37.01
2006	36.68
2007	34.17
2008	39.17
2009	36.36
2010	35.69
2011	39.83
2012	40.89
2013	40.26