Year	Percent
1995	28.99
1996	29.15
1997	28.86
1998	28.98
1999	29.52
2000	28.18
2001	26.88
2002	28.6
2003	24.62
2004	25.57
2005	28.03
2006	29.08
2007	28
2008	26.92
2009	26.13
2010	29.87