Year	%
1972	86.52793
1974	92.85403
1975	77.68491
1976	70.7264
1977	84.68066
1979	89.10846
1980	92.70453
1982	100
1983	85.34613
2002	87.36521
2003	97.72262
2004	96.56265
2005	99.89629
2006	100
2007	99.85816
2008	100
2009	99.28104
2010	100
2011	99.24229
2012	100
2013	99.49669
2014	100
2016	100
2017	100