Year	Grams per day
1961	12.86
1962	14.16
1963	16.21
1964	16.81
1965	14.6
1966	17.49
1967	16.76
1968	14.26
1969	12.61
1970	11.71
1971	12.59
1972	12.85
1973	16.37
1974	13.65
1975	9.35
1976	11.9
1977	11.95
1978	12.57
1979	12.91
1980	9.76
1981	14.2
1982	14.74
1983	15.75
1984	17.45
1985	18.66
1986	19.81
1987	19.51
1988	19.44
1989	18.97
1990	21.22
1991	21.42
1992	20.38
1993	19.89
1994	19.22
1995	19.13
1996	23.85
1997	28.6
1998	27.64
1999	29.92
2000	30.56
2001	35.95
2002	34.82
2003	36.85
2004	37.55
2005	36.97
2006	38.77
2007	46.82
2008	47.9
2009	46.95
2010	45.3
2011	46.75
2012	47.58
2013	46.22