Year	Percent
1995	67.81
1996	75.99
1997	68.77
1998	65.36
1999	59.44
2000	61.92
2001	63.1
2002	63.56
2003	48.85
2004	53.43
2005	47.09
2006	53.73
2007	55.79
2008	57.03
2009	59.87
2010	61.74