Year	Percent
1995	35.72
1996	36.38
1997	35.02
1998	34.11
1999	34.62
2000	36.15
2001	43.17
2002	38.1
2003	40.07
2004	39.48
2005	38.06
2006	41.42
2007	45.77
2008	46.48
2009	46.1
2010	49.08