Year	Percent
1995	47.96
1996	47.05
1997	47.16
1998	47.94
1999	46.58
2000	39.99
2001	39.24
2002	42.01
2003	40.21
2004	40.88
2005	39.89
2006	37.97
2007	39.65
2008	40.06
2009	38.34
2010	40.6