Year	Percent
1995	33.1
1996	31.5
1997	32.41
1998	32.87
1999	33.38
2000	32.98
2001	31.79
2002	31.56
2003	31.62
2004	31.86
2005	30.63
2006	30.79
2007	30.57
2008	30.5
2009	30.49
2010	30.87