Year	%
1990	78.11163
1991	69.51928
1992	75.30747
1993	72.06669
1994	78.19644
1995	81.01266
1996	81.59616
1997	81.32432
1998	83.69997
1999	80.66524
2000	83.91581
2001	85.36794
2002	86.49322
2003	84.93557
2004	85.85849
2005	86.93463
2006	90.44905
2007	89.31593
2008	88.4575
2009	89.07857
2010	88.72482
2011	91.97439
2012	83.33333
2013	92.85936
2014	90.04713
2015	90.27535
2016	90.49404
2017	98.79534