Year	Percent
1995	16.3
1996	16.23
1997	16.33
1998	16.35
1999	14.6
2000	14.67
2001	14.41
2002	14.11
2003	13.98
2004	14.22
2005	14.05
2006	13.84
2007	13.6
2008	13.26
2009	13.17
2010	13.11