Year	Percent
1995	37.38
1996	34.74
1997	34.31
1998	32.89
1999	32.43
2000	33.98
2001	33.88
2002	32.16
2003	32.03
2004	32.88
2005	32.93
2006	33.89
2007	34.26
2008	34.91
2009	32.16
2010	31.85