Year	Percent
1995	67.57
1996	67.63
1997	68.83
1998	68.34
1999	65.56
2000	67.97
2001	70.36
2002	70.61
2003	70.74
2004	69.13
2005	68.36
2006	66.84
2007	65.09
2008	62.92
2009	60.21
2010	61.16