Year	%
1984	91.3022
1985	91.85793
1986	91.21399
1987	91.07816
1988	90.60161
1989	90.98805
1990	91.10368
1991	91.32477
1992	91.46165
1993	92.06101
1994	92.22767
1995	92.80976
1996	93.17284
1997	93.56842
1998	94.40866
1999	95.07321
2000	95.48902
2001	96.07854
2002	96.46903
2003	96.90092
2004	96.91948
2005	96.96806
2006	97.02688
2007	97.14948
2008	97.30175
2009	97.36592
2010	97.55999
2011	97.55328
2012	96.72979
2013	97.20609
2014	97.6273
2015	97.56913
2016	97.56217
2017	97.52933