Year	Percent
1995	41.3
1996	41.12
1997	39.67
1998	35.82
1999	40.06
2000	42.16
2001	40.82
2002	40.82
2003	41.16
2004	40.17
2005	38.02
2006	34.83
2007	35.46
2008	31.56
2009	33.22
2010	35.93