Year	Percent
1995	39.65
1996	30.34
1997	28.23
1998	27.2
1999	30.9
2000	20.41
2001	24.04
2002	30.08
2003	28.64
2004	32.34
2005	36.74
2006	42
2007	44.44
2008	50.86
2009	40.76
2010	40.62