Year	Percent
1995	71.12
1996	75.32
1997	82.32
1998	77.04
1999	76.51
2000	75.49
2001	71.55
2002	70.49
2003	73.84
2004	74.74
2005	72.94
2006	70.23
2007	69.15
2008	65.08
2009	64.02
2010	77.69