Year	%
1998	100
1999	98.41176
2000	99.12745
2004	100
2005	99.12079
2006	98.7748
2007	98.70389
2008	97.1913
2009	96.64537
2010	95.43236
2011	93.81716
2012	90.91398
2013	89.48228
2014	87.32456
2015	87.29868
2016	91.66313