Year	Percent
1995	65.36
1996	67.34
1997	70.4
1998	63.44
1999	68.6
2000	68.89
2001	76.28
2002	81.3
2003	75.55
2004	75.2
2005	70.46
2006	67.7
2007	68.3
2008	64.71
2009	57.05
2010	55.78