Year	%
1993	100
1998	99.77872
1999	100
2001	98.8593
2005	99.71276
2006	99.566
2007	99.61578
2008	99.93532
2009	99.75714
2010	99.92016
2011	99.75392
2012	100
2013	99.94233
2014	88.54402
2015	98.79466
2016	99.58114
2017	99.74342