Year	Grams per day
1993	10.11
1994	8.69
1995	9.33
1996	10.52
1997	11.12
1998	10.97
1999	11.52
2000	11.49
2001	11.62
2002	11.28
2003	11.56
2004	15.41
2005	14.97
2006	15.81
2007	15.33
2008	16.33
2009	14.82
2010	16.09
2011	17.77
2012	15.67
2013	18.09