Year	Percent
1999	92.73378
2000	93.77079
2001	92.84191
2002	95.4146
2003	94.97502
2004	94.39106
2005	94.57278
2006	96.20533
2007	95.99029
2008	95.98173
2009	94.14147
2010	90.23847