Year	%
1992	92.92507
1993	93.8966
1994	93.98488
1995	94.12344
1996	95.93679
1997	96.49026
1998	96.94505
1999	97.4771
2000	97.70364
2001	95.96845
2002	95.95122
2003	97.66348
2004	98.67874
2005	99.64777
2006	99.59829
2007	99.47517
2008	99.12882
2009	99.10466
2010	99.20954
2011	99.57704
2012	97.49283
2013	98.60716
2014	98.82052
2015	99.69362
2016	99.4776
2017	99.71808