Year	Percent
1995	48.35
1996	50.26
1997	45.11
1998	45.22
1999	45.26
2000	45.17
2001	41.28
2002	41.06
2003	43.14
2004	41.45
2005	47.56
2006	43.71
2007	46.03
2008	41.5
2009	42.02
2010	41.31