Year	Percent
1995	35.56
1996	34.77
1997	33.81
1998	27.96
1999	33.85
2000	35.18
2001	31.25
2002	31.19
2003	31.4
2004	30.83
2005	30.86
2006	29.57
2007	30.21
2008	30.13
2009	29.92
2010	29.91