Year	Grams per day
1961	33.94
1962	36.94
1963	37.11
1964	37.98
1965	39.8
1966	41.06
1967	40.17
1968	40.52
1969	40.51
1970	42.08
1971	42.99
1972	44.39
1973	46.39
1974	47.77
1975	51.49
1976	53.25
1977	57
1978	61.02
1979	67.63
1980	71.8
1981	75.93
1982	84.09
1983	86.33
1984	90.92
1985	88.75
1986	86.81
1987	84.07
1988	85.69
1989	84.74
1990	86.61
1991	86.12
1992	84.87
1993	80.02
1994	78.55
1995	79.51
1996	79.92
1997	83.44
1998	79.27
1999	80.95
2000	82.1
2001	88.12
2002	83.52
2003	76.36
2004	75.94
2005	74.41
2006	72.49
2007	72.51
2008	74.56
2009	68.53
2010	81.16
2011	82.88
2012	73.88
2013	77.99