Year	%
1986	90.13879
1987	92.99212
1999	94.66748
2000	92.12846
2001	94.73468
2002	88.7099
2010	91.62751
2013	91.14428
2014	90.00947
2015	90.55221
2016	90.32743
2017	90.96657