Year	%
1998	100
1999	100
2001	99.90701
2004	99.36559
2005	99.96186
2006	96.45118
2007	97.90762
2008	100
2009	99.84512
2010	99.73628
2011	97.68099
2012	99.82754
2013	100
2014	99.99625
2015	99.89736
2016	99.88326