Year	Percent
1995	13.46
1996	14.67
1997	14.18
1998	16.67
1999	17.86
2000	18.53
2001	17.95
2002	16.77
2003	14.56
2004	16.65
2005	16.26
2006	14.97
2007	15.63
2008	15.12
2009	14.13
2010	15.45