Year	Percent
1995	53.6
1996	59.14
1997	61.36
1998	60.34
1999	61.09
2000	66.49
2001	69.24
2002	67.13
2003	64.1
2004	65.38
2005	66.44
2006	66.97
2007	66.23
2008	68.7
2009	64.53
2010	60.28