Year	%
1982	85.78278
1983	87.0448
1984	86.89175
1985	89.87647
1986	89.23927
1987	88.93952
1988	88.53563
1989	87.96016
1990	83.74245
1991	83.64452
1992	83.27722
1993	83.86356
1994	84.52689
1995	85.28653
1996	85.56366
1997	86.40322
1998	87.24316
1999	87.56569
2000	89.51844
2001	86.85013
2002	89.19348
2003	89.96465
2004	90.27621
2005	91.03467
2006	92.21379
2007	94.53474
2008	92.92741
2009	94.72295
2010	93.72743
2011	92.87353
2012	91.52026
2013	93.17855
2014	90.96223
2015	91.27227
2016	91.72793
2017	93.27782