Year	Percent
1995	15.05
1996	13.29
1997	14.15
1998	15.8
1999	17.28
2000	16.62
2001	16.6
2002	15.68
2003	15.54
2004	17.41
2005	16.5
2006	15.91
2007	15.5
2008	14.96
2009	11.91