Year	Grams per day
1961	66.83
1962	64.99
1963	64.13
1964	51.13
1965	59.57
1966	52.6
1967	41.9
1968	40.3
1969	25.74
1970	30.19
1971	12.33
1972	11.13
1973	43.02
1974	41.38
1975	37.38
1976	50.27
1977	55.89
1978	51.25
1979	63.15
1980	61.24
1981	65.57
1982	70.66
1983	72.98
1984	61.98
1985	56.36
1986	62.47
1987	50.33
1988	61.09
1989	61.54
1990	78.88
1991	69.73
1992	62.69
1993	64.54
1994	67.27
1995	70.52
1996	69.99
1997	65.22
1998	61.1
1999	58.95
2000	62.15
2001	69.68
2002	73.21
2003	80.85
2004	87.78
2005	96.49
2006	83.67
2007	85.44
2008	102.16
2009	97.19
2010	100.12
2011	105.34
2012	104.38
2013	101.6