Year	%
1975	67.57912
1999	96.35379
2000	94.79813
2001	96.77436
2004	93.94472
2005	94.0255
2006	95.15405
2007	94.6803
2008	100
2009	98.51344
2010	93.15442
2011	89.36794
2012	97.64427
2013	89.55101
2014	88.42598
2015	95.50459
2016	94.209
2017	94.44697