Year	Percent
1995	59.56
1996	53
1997	41.94
1998	43.57
1999	73.35
2000	72.3
2001	71.91
2002	70.84
2003	67.97
2004	49.34
2005	50.69
2006	53.13
2007	54.61
2008	63.79
2009	65.32
2010	67.06