Year	Percent
1995	40.97
1996	51.14
1997	49.1
1998	40.45
1999	32.33
2000	33.5
2001	40.11
2002	33.39
2003	36.46
2004	34.87
2005	37.27
2006	37.85
2007	42.1
2008	48.44
2009	47.23
2010	46.89