Year	Grams per day
1961	29.92
1962	33.15
1963	37.11
1964	40.87
1965	45.98
1966	48.76
1967	45.89
1968	52.44
1969	56.29
1970	58.18
1971	59.52
1972	61.15
1973	61.38
1974	61.75
1975	61.42
1976	76.12
1977	76.79
1978	80.27
1979	83.13
1980	85.58
1981	73.4
1982	74.96
1983	77.31
1984	78.92
1985	76.21
1986	69.67
1987	66.92
1988	68.64
1989	70.01
1990	69.77
1991	70.55
1992	73.32
1993	71.24
1994	73.17
1995	70.34
1996	73.94
1997	58.9
1998	61.27
1999	61.98
2000	69.41
2001	72.49
2002	70.86
2003	73.79
2004	76.76
2005	77.52
2006	84.99
2007	74.85
2008	67.05
2009	69.5
2010	69.17
2011	68.2
2012	69.02
2013	70.11