Year	Percent
1995	68.54
1996	56.29
1997	54.6
1998	53.19
1999	50.09
2000	46.18
2001	46.73
2002	48.75
2003	54.19
2004	62.15
2005	66.14
2006	68.41
2007	70.25
2008	69.03
2009	73.51
2010	75.84