Year	Grams per day
1961	159.82
1962	158.56
1963	144.92
1964	141.72
1965	132.88
1966	130.04
1967	123.29
1968	118.41
1969	129.39
1970	120.34
1971	128.57
1972	136.17
1973	138.5
1974	149.7
1975	169.01
1976	180.57
1977	178.26
1978	189.94
1979	182.95
1980	187.93
1981	174.75
1982	183.65
1983	188
1984	183.48
1985	186.64
1986	183.47
1987	199.96
1988	180.69
1989	180.33
1990	172.7
1991	178.04
1992	183.28
1993	178.95
1994	177.81
1995	178.14
1996	170.11
1997	172.23
1998	173.22
1999	178.51
2000	172
2001	175.39
2002	171.71
2003	173.26
2004	173.85
2005	168.89
2006	166.54
2007	167.39
2008	166.86
2009	163.78
2010	149.53
2011	150.82
2012	155.42
2013	159.96