Year	Percent
1995	36.19
1996	36.6
1997	35.88
1998	36.13
1999	47.66
2000	49.14
2001	43.45
2002	46.58
2003	45.55
2004	41.98
2005	38.07
2006	41.51
2007	47.84
2008	41.52
2009	40.79
2010	40.61