Year	Percent
1995	39.53
1996	40.98
1997	43.05
1998	42.93
1999	44.2
2000	47.57
2001	44.17
2002	40.01
2003	40.23
2004	39.81
2005	39.23
2006	35.38
2007	34.77
2008	32.38
2009	35.12
2010	35.34