Year	Grams per day
1961	37.59
1962	38.91
1963	36.66
1964	36.67
1965	38.59
1966	39.61
1967	39.87
1968	40.37
1969	41.88
1970	44.63
1971	50.03
1972	50.62
1973	53.89
1974	54.18
1975	45.86
1976	36.04
1977	44.92
1978	47.49
1979	51.76
1980	57.37
1981	67.58
1982	61.76
1983	55.82
1984	67.07
1985	70.17
1986	75.15
1987	64.57
1988	60.21
1989	65.49
1990	58.1
1991	55.46
1992	52.76
1993	48.45
1994	50.22
1995	50.02
1996	44.77
1997	41.37
1998	49.28
1999	49.14
2000	57.27
2001	53.89
2002	52.31
2003	51.83
2004	51.72
2005	52.33
2006	51.05
2007	49.33
2008	48.34
2009	47.02
2010	46.75
2011	45.49
2012	44.39
2013	43.67