Year	Percent
1995	57.71
1996	58.09
1997	55.53
1998	56.64
1999	55.5
2000	56.96
2001	59.1
2002	52.88
2003	49.41
2004	44.08
2005	38.13
2006	39.38
2007	37.24
2008	38.06
2009	37.12
2010	36.21