Year	%
1984	89.90532
1985	89.87323
1986	89.03695
1987	89.12784
1988	87.92429
1989	88.43842
1990	88.81403
1991	89.71295
1992	91.0167
1993	92.09074
1994	92.24
1995	92.49052
1996	94.32606
1997	95.0469
1998	95.68417
1999	96.26852
2000	96.55731
2001	95.22386
2002	95.40443
2003	97.16392
2004	98.12679
2005	99.20574
2006	99.24303
2007	99.18136
2008	99.03711
2009	99.11782
2010	99.23867
2011	99.35684
2012	97.04944
2013	98.36089
2014	98.64004
2015	99.57214
2016	99.51249
2017	99.6464