Year	%
1992	89.94685
1993	90.97737
1994	90.90281
1995	91.4882
1996	93.26458
1997	93.82908
1998	94.79003
1999	95.3653
2000	95.6909
2001	94.8661
2002	95.22784
2003	96.8892
2004	97.7084
2005	98.79159
2006	98.91144
2007	98.88318
2008	98.92066
2009	99.0516
2010	99.20419
2011	99.07929
2012	96.74369
2013	98.15228
2014	98.48564
2015	99.41371
2016	99.54426
2017	99.56388