Year	Grams per day
1961	5.17
1962	5.18
1963	4.77
1964	4.52
1965	5.01
1966	6.58
1967	10.21
1968	14.09
1969	19.06
1970	20.73
1971	22.89
1972	23.21
1973	25.5
1974	22.66
1975	21.3
1976	25.47
1977	32.63
1978	41.27
1979	47.14
1980	43.12
1981	38.44
1982	42.83
1983	49.71
1984	56.26
1985	58.76
1986	66.65
1987	70.71
1988	79.44
1989	86.71
1990	88.26
1991	91.65
1992	92.04
1993	87.35
1994	84.23
1995	86.38
1996	87.63
1997	92.62
1998	80.7
1999	90.82
2000	96.29
2001	99.97
2002	103.48
2003	103.08
2004	102.65
2005	104.12
2006	103.56
2007	100.03
2008	99.93
2009	95.11
2010	104.4
2011	100.06
2012	103.25
2013	105.24