Year	Percent
1995	28.99
1996	29.15
1997	28.86
1998	28.98
1999	29.52
2000	30.94
2001	29.51
2002	31.4
2003	27.03
2004	28.08
2005	30.78
2006	31.95
2007	30.77
2008	29.59
2009	28.71
2010	32.83