Year	Percent
1995	70.93
1996	70.93
1997	71.85
1998	70.1
1999	70.04
2000	69.99
2001	68.47
2002	72.65
2003	70.94
2004	68.85
2005	66
2006	63
2007	61.37
2008	61.98
2009	61.86
2010	61.87