Year	Grams per day
1992	35.16
1993	36.52
1994	27.72
1995	30.28
1996	42.18
1997	39.52
1998	54.06
1999	45.33
2000	41.78
2001	27.13
2002	18.58
2003	12.32
2004	13.15
2005	22.64
2006	34.2
2007	56.12
2008	33.38
2009	28.56
2010	28.34
2011	27.95
2012	27.66
2013	27.62