Year	Percent
1995	42.6
1996	42.44
1997	35.93
1998	32.49
1999	37.01
2000	41.48
2001	40.67
2002	39.3
2003	38.13
2004	41.4
2005	43.29
2006	41.66
2007	46.51
2008	44.95
2009	40.05
2010	34.9