Year	Percent
1995	72.58
1996	71.19
1997	73.25
1998	65.41
1999	66.6
2000	63.48
2001	62.01
2002	56.04
2003	61.49
2004	61.23
2005	60.57
2006	57.41
2007	56.63
2008	52.6
2009	53.33
2010	50.48