Year	Percent
1995	39.98
1996	41.72
1997	38.49
1998	33.94
1999	29.22
2000	32.23
2001	35.13
2002	35.46
2003	32.98
2004	38.29
2005	31.57
2006	33.26
2007	30.81
2008	32
2009	30.68
2010	34.71