Year	%
1970	94.18037
1971	95.7546
1972	94.78348
1974	94.84579
1975	94.10462
1976	91.48249
1977	87.50145
1978	91.78159
1979	87.29172
1980	85.60879
2014	98.76501
2015	99.21874