Year	%
1985	82.54912
1986	82.28424
1987	83.62853
1988	79.50002
1989	80.13357
1990	81.06621
1991	82.10541
1992	83.21922
1993	84.17584
1994	85.20342
1995	86.13851
1996	86.97314
1997	87.77018
1998	88.66835
1999	89.42835
2000	88.595
2001	90.70417
2002	88.86428
2003	90.25422
2004	89.69637
2005	90.78618
2006	92.12294
2007	91.05315
2008	91.24999
2009	90.92858
2010	90.43022
2011	91.93887
2012	90.84885
2013	91.14488
2016	91.25275
2017	92.23703