Year	%
1992	93.65661
1993	94.48271
1994	94.28814
1995	94.66642
1996	96.39231
1997	96.64946
1998	97.2847
1999	97.7636
2000	97.96159
2001	96.3867
2002	96.36998
2003	97.93911
2004	98.85621
2005	99.73209
2006	99.68114
2007	99.54614
2008	99.20559
2009	99.18236
2010	99.27007
2011	99.61137
2012	97.68857
2013	98.71079
2014	98.90338
2015	99.70943
2016	99.50903
2017	99.73263