Year	Percent
1995	40.28
1996	41.98
1997	42.13
1998	56.61
1999	69.03
2000	64.93
2001	72.02
2002	73.08
2003	73.98
2004	82.7
2005	87.18
2006	86.59
2007	88.03
2008	75.34
2009	71.7
2010	66.71