Year	%
1985	86.61269
1986	86.68017
1987	89.04747
1988	80.44102
1989	81.04409
1990	82.04491
1991	83.10423
1992	84.15361
1993	85.19243
1994	86.29355
1995	87.27405
1996	88.25257
1997	89.18574
1998	90.128
1999	91.05992
2000	89.27817
2001	91.77891
2002	87.28032
2003	89.45738
2004	89.37663
2005	89.68308
2006	90.49221
2007	90.22123
2008	90.13803
2009	90.23342
2010	89.97825
2011	90.38838
2012	90.05935
2013	90.37114
2014	89.04664
2015	90.28481
2016	89.59262
2017	91.19497