Year	Percent
1995	80.28
1996	70.59
1997	72
1998	71.3
1999	74.5
2000	66.11
2001	65.95
2002	65.45
2003	64.41
2004	62.47
2005	59.77
2006	62.13
2007	63.29
2008	64.08
2009	69.7
2010	67.16