Year	Grams per day
1961	26.71
1962	28.95
1963	29.04
1964	31.14
1965	34.32
1966	42.06
1967	43.75
1968	40.68
1969	42.5
1970	37.77
1971	35.6
1972	28.31
1973	28.38
1974	29.21
1975	27.67
1976	27.79
1977	25.83
1978	23.96
1979	24.88
1980	24.26
1981	24.28
1982	24.11
1983	23.74
1984	23.33
1985	21.29
1986	24.2
1987	23.67
1988	23.95
1989	23.3
1990	22.37
1991	20.16
1992	20.07
1993	20.83
1994	20
1995	19.39
1996	18.92
1997	22.58
1998	20.74
1999	18.61
2000	18.14
2001	22.27
2002	18.51
2003	17.1
2004	21.91
2005	28.7
2006	24.64
2007	23.68
2008	22.68
2009	22.84
2010	21.92
2011	22.55
2012	22.28
2013	22.09