Year	%
1991	92.79551
1994	93.99529
1995	93.58121
1999	92.50426
2000	93.63785
2002	100
2003	94.22236
2004	100
2005	92.93015
2006	94.17314
2007	96.25312
2008	96.26142
2009	94.96021
2010	96.89039
2011	100
2012	95.21656
2013	97.28208
2014	97.25356
2015	95.8042
2016	93.49257
2017	97.43146