Year	Percent
1995	69.04
1996	72.11
1997	75.71
1998	71.53
1999	71.71
2000	81.86
2001	73.27
2002	74.83
2003	72.75
2004	74.62
2005	69.58
2006	62.02
2007	58.43
2008	55.48
2009	56.55
2010	59.36