Year	%
1992	82.66465
1993	84.32182
1996	78.1262
1998	80.72413
1999	80.21849
2000	81.29553
2001	85.02698
2002	86.75904
2003	85.33895
2004	85.2203
2005	83.35547
2006	83.33333
2007	83.90961
2008	85.14532
2009	84.89577
2010	84.6216
2011	86.25994
2012	88.27274
2013	91.64324
2014	90.20914
2015	89.61929
2016	88.99404
2017	87.56268