Year	Percent
1995	26.05
1996	26.46
1997	24.32
1998	23.99
1999	23.25
2000	23.17
2001	23.91
2002	24.2
2003	24.48
2004	24.3
2005	23.86
2006	24.01
2007	23.61
2008	22.84
2009	22.34
2010	22.49