Year	Percent
1999	90.28244
2000	91.59925
2001	90.19817
2002	94.03208
2003	93.25319
2004	92.46737
2005	92.71878
2006	95.38531
2007	94.41326
2008	94.56353
2009	91.06496
2010	87.15062