Year	%
1982	77.00355
1983	78.94439
1984	77.9608
1985	77.99588
1986	78.76675
1987	78.87825
1989	80.11457
1990	80.73768
1991	80.22547
1992	80.80636
1993	81.12076
1994	81.94718
1995	82.47025
1996	82.76321
1998	84.54516
2000	85.56508
2001	84.58752
2003	87.93718
2004	89.25876
2005	89.54028
2006	89.51271
2007	90.20213
2008	89.73817
2009	90.73863
2011	90.97999
2016	90.93202
2017	91.23591