Year	%
1985	99.39998
1986	99.60398
1987	98.50018
1988	99.50024
1989	93.36703
1990	99.84342
1991	98.6014
1992	96.42303
1993	95.11968
1994	98.68301
1995	100
1996	98.05831
1998	98.72592
2000	99.65849
2001	98.59813
2002	98.93118
2003	98.61659
2004	98.35313
2005	98.43347
2006	97.8375
2007	97.40366
2008	98.3046
2009	99.19524
2010	99.04596
2011	99.28449
2012	99.78383
2013	100
2014	99.47173
2015	98.90545
2016	99.79367