Year	%
1979	92.36679
1980	92.62141
1981	93.47987
1982	94.66492
1983	94.78293
1984	94.41633
2002	100
2003	99.76569
2004	100
2005	100
2006	99.66786
2007	99.94425
2008	99.70184
2010	99.56538
2011	99.90408
2012	99.91875
2013	99.47115
2014	99.58346
2015	99.23659
2016	99.09205
2017	99.8591