Year	Percent
1995	52.26
1996	39.58
1997	36.12
1998	34.45
1999	30.08
2000	32.89
2001	44.93
2002	40.19
2003	44.11
2004	49.23
2005	46.51
2006	48.2
2007	48.02
2008	46.5
2009	47.24
2010	46.58