Year	Percent
1995	65.49
1996	67.39
1997	66.96
1998	64.98
1999	64.84
2000	69.05
2001	68.54
2002	69.52
2003	67.93
2004	72.6
2005	73.6
2006	67.1
2007	60.02
2008	66.04
2009	62.46
2010	62.16