Year	Percent
1995	41.48
1996	41.36
1997	39.83
1998	36.01
1999	40.36
2000	42.5
2001	41.2
2002	41.21
2003	41.48
2004	40.48
2005	38.2
2006	34.92
2007	35.74
2008	31.81
2009	33.51
2010	36.25