Year	Percent
1995	15.17
1996	15.15
1997	15.07
1998	15.29
1999	15.34
2000	15.49
2001	15.69
2002	15.91
2003	16.16
2004	16.33
2005	16.41
2006	16.49
2007	16.49
2008	16.32
2009	16.34
2010	16.34