Year	%
1998	99.91105
1999	99.75271
2000	100
2001	99.85673
2002	99.51265
2003	99.601
2004	99.90383
2005	99.37706
2006	100
2007	100
2008	100
2009	99.86645
2010	99.61054
2011	99.44726
2012	100
2013	99.94283
2014	100
2015	99.91709
2016	100