Year	Percent
1999	0.89676
2000	0.88798
2001	0.87124
2002	0.8757
2003	0.87983
2004	0.88501
2005	0.8846
2006	0.88025
2007	0.89221
2008	0.91268
2009	0.92181
2010	0.91268
2011	0.91549
2012	0.92849
2013	0.9291