Year	Percent
1995	33.54
1996	35.81
1997	33.98
1998	32.05
1999	30.74
2000	30.99
2001	34.49
2002	34.82
2003	35.82
2004	36.65
2005	36.86
2006	34.28
2007	33.64
2008	32.12
2009	32.9
2010	29.03