Year	Percent
1995	37.92
1996	27.09
1997	31.01
1998	33.74
1999	34.94
2000	45.84
2001	43.78
2002	60.39
2003	72.13
2004	73.14
2005	73.92
2006	68.89
2007	64.33
2008	62.44
2009	65.15
2010	60.18