Year	Percent
1995	15.3
1996	15.17
1997	15.01
1998	14.95
1999	15.06
2000	14.71
2001	14.3
2002	15.26
2003	14.78
2004	15.17
2005	14.34
2006	14.45
2007	13.91
2008	13.79
2009	14.65
2010	14.65