Year	%
1996	99.96398
2000	98.92651
2001	98.88929
2002	99.55339
2003	99.7172
2004	99.9207
2005	99.97696
2006	99.99497
2007	99.96703
2008	99.84237
2009	99.82524
2010	99.96379
2011	99.99645
2012	99.92183
2013	99.75252
2014	99.68696
2015	99.92889
2016	99.14873
2017	99.67997
2018	99.53347