Year	Percent
1995	16.66
1996	16.46
1997	20.11
1998	17.89
1999	20.08
2000	18.95
2001	18.25
2002	19.35
2003	19
2004	18.54
2005	18.57
2006	18.33
2007	18.27
2008	13.36
2009	15.71
2010	14.74