Year	Grams per day
1992	42.12
1993	54.87
1994	46.92
1995	53.39
1996	52.54
1997	58.22
1998	58.65
1999	54.89
2000	57.84
2001	54.98
2002	55.16
2003	55.59
2004	62.23
2005	65.28
2006	62.88
2007	65.71
2008	66.06
2009	67.09
2010	71.6
2011	70.42
2012	73.92
2013	75.07