Year	%
1983	65.82307
1984	66.15596
1985	64.17211
1986	67.19113
1987	63.05025
1988	71.02542
1989	66.6985
1990	74.77594
1991	67.32437
1992	71.9708
1993	69.94721
1994	74.01227
1995	77.60988
1996	77.56301
1997	78.97355
1998	81.34819
1999	77.99549
2000	80.76002
2001	80.91838
2002	81.65054
2003	80.68959
2004	82.09752
2005	83.47745
2006	86.32062
2007	85.49036
2008	84.74182
2009	85.45101
2010	85.83628
2011	87.68455
2012	78.11437
2013	90.2434
2014	85.84674
2015	85.85682
2016	87.53936
2017	99.41551