Year	Grams per day
1961	142.62
1962	143.92
1963	140.74
1964	145.25
1965	147.34
1966	147.18
1967	150.17
1968	151.45
1969	155.18
1970	156.1
1971	158.67
1972	161.28
1973	161.9
1974	157.21
1975	151.85
1976	159.74
1977	163.28
1978	160.16
1979	161.72
1980	157.51
1981	156.1
1982	154.41
1983	155.87
1984	158.89
1985	160.3
1986	161.71
1987	166.88
1988	168.59
1989	168.32
1990	173.28
1991	174.78
1992	177.37
1993	180.6
1994	183.23
1995	182.55
1996	185.99
1997	192.63
1998	194.43
1999	187.94
2000	189.39
2001	186.31
2002	193.4
2003	191.89
2004	194.15
2005	192.85
2006	187.25
2007	174.9
2008	169.61
2009	164.9
2010	166.57
2011	171.66
2012	174.05
2013	174.67