Year	Percent
1995	44.64
1996	41.38
1997	46.75
1998	61.04
1999	60.61
2000	68.75
2001	65.51
2002	66.28
2003	77.85
2004	77.01
2005	77.68
2006	76.19
2007	75.73
2008	73.47
2009	65.12
2010	62.79