Year	Percent
1995	51.95
1996	48.94
1997	45.87
1998	41.08
1999	40.5
2000	41.53
2001	36.26
2002	37.38
2003	38
2004	38.28
2005	37.9
2006	35.72
2007	34.73
2008	34.17
2009	32.43
2010	31.35