Year	Grams per day
1961	36.76
1962	44.54
1963	34.79
1964	33.47
1965	40.02
1966	37.32
1967	44.86
1968	43.86
1969	47.67
1970	48.32
1971	53.43
1972	46.65
1973	47.72
1974	44.42
1975	30.75
1976	30.85
1977	31.99
1978	60.93
1979	51.44
1980	37.96
1981	31.67
1982	30.59
1983	38.06
1984	38.17
1985	43.81
1986	34.99
1987	30.48
1988	36.79
1989	28.73
1990	26.73
1991	27.65
1992	31.77
1993	25.28
1994	30.49
1995	34.34
1996	42.95
1997	41.86
1998	41.1
1999	41.24
2000	41.68
2001	40.94
2002	42.68
2003	42.47
2004	43.51
2005	42.63
2006	39.13
2007	50.97
2008	52.76
2009	54.33
2010	54.66
2011	55.45
2012	49.75
2013	51.39