Year	%
1985	73.83499
1986	74.05284
1987	74.91202
1988	73.64376
1989	74.51486
1990	76.63284
1991	78.17966
1992	80.15927
1993	80.02259
1994	81.70803
1995	84.31033
1996	85.0049
1997	85.10114
1998	85.24395
1999	86.02671
2000	86.41724
2001	87.89899
2002	88.15334
2003	88.33111
2004	88.39463
2005	89.36184
2006	90.44382
2007	90.63892
2008	90.627
2009	90.57042
2010	90.57946
2011	90.84898
2012	89.71412
2013	89.52445
2014	89.71521
2015	90.33001
2016	90.02481
2017	90.51972