Year	Percent
1995	37.93
1996	40.28
1997	41.61
1998	43.05
1999	46.67
2000	51.99
2001	51.67
2002	50.13
2003	50.61
2004	47.13
2005	47.25
2006	45.15
2007	40.16
2008	38.12
2009	29.7
2010	32.34