Year	Grams per day
1961	19.4
1962	27.08
1963	41.08
1964	42.58
1965	45.04
1966	47.87
1967	47.56
1968	47.04
1969	52.24
1970	53.33
1971	55.59
1972	60.3
1973	68.07
1974	65.48
1975	67.02
1976	71.35
1977	77.88
1978	78.53
1979	81.3
1980	69.97
1981	69.96
1982	81.27
1983	79.52
1984	83.3
1985	77
1986	83.03
1987	90.65
1988	82.88
1989	86.37
1990	89.24
1991	88.73
1992	88.16
1993	88.98
1994	84.8
1995	83.71
1996	86.68
1997	92.91
1998	92.24
1999	81.16
2000	84.2
2001	84.91
2002	76.2
2003	72.43
2004	77.86
2005	80.32
2006	88.01
2007	77.97
2008	84.23
2009	88.39
2010	90.49
2011	85.42
2012	86.25
2013	87.33