Year	Percent
1995	38.76
1996	36.4
1997	43.8
1998	46.49
1999	50.09
2000	48.2
2001	45.7
2002	43.81
2003	41.7
2004	41.45
2005	40.54
2006	39.23
2007	38.15
2008	42.34
2009	44.97
2010	43.37