Year	Grams per day
1992	61.28
1993	55.07
1994	58.21
1995	57.71
1996	52.85
1997	54.22
1998	55.81
1999	57.09
2000	56.89
2001	71.18
2002	81.16
2003	77.95
2004	91.91
2005	93.4
2006	85
2007	88.66
2008	86.76
2009	81.95
2010	72.71
2011	78.16
2012	78.71
2013	78.41