Year	Percent
1995	35.45
1996	35.86
1997	35.16
1998	35.41
1999	46.87
2000	48.43
2001	42.65
2002	45.85
2003	44.84
2004	41.33
2005	37.48
2006	40.95
2007	47.2
2008	40.99
2009	40.29
2010	40.1