Year	Percent
1995	49.18
1996	43.11
1997	47.47
1998	47.66
1999	47.22
2000	50.39
2001	48.04
2002	51.34
2003	53.3
2004	41.85
2005	40.2
2006	39.02
2007	37.68
2008	38.43
2009	39.31
2010	37.94