Year	Percent
1993	0.9856
1994	0.98869
1995	0.98878
1996	0.98186
1997	0.98079
1998	0.97377
1999	0.9749
2000	0.97304
2001	0.97532
2002	0.98052
2003	0.97719
2004	0.97414
2005	0.9723
2007	0.96611
2008	0.96293
2009	0.96695
2010	0.9766
2012	0.98279
2013	0.97886
2014	0.97674
2015	0.98818