Year	%
1970	65.41314
1971	72.12967
1972	79.959
1973	80.28842
1974	80.99994
1992	92.06165
1993	91.19794
1994	92.07209
1995	92.47279
1996	92.84183
1997	93.58922
1998	94.54215
1999	94.96687
2000	95.21528
2001	96.38089
2002	95.90754
2003	95.31977
2004	95.34061
2005	95.19009
2006	95.39916
2007	95.24317
2008	95.80849
2009	95.61433
2010	95.70008
2011	95.52865
2012	95.71331
2013	95.77655
2014	95.56799
2015	95.6832
2016	95.82466
2017	96.00999