Year	Percent
1995	39.3
1996	40.99
1997	37.86
1998	33.38
1999	28.75
2000	31.71
2001	34.58
2002	34.98
2003	32.57
2004	37.82
2005	31.21
2006	32.92
2007	30.52
2008	31.68
2009	30.39
2010	34.39