Year	%
1993	100
1994	100
1995	97.17902
1996	99.68963
1998	97.53752
1999	99.71154
2000	100
2001	99.12654
2002	100
2003	100
2004	99.18664
2005	99.39026
2006	100
2007	97.49492
2010	99.60756
2011	98.16132
2012	97.60368
2013	98.18751
2014	98.02455
2015	97.91476
2016	97.60337
2017	97.64418