Year	%
1980	98.45473
1981	98.72845
1982	99.17474
1983	99.6203
1984	99.11401
1985	99.72808
1986	99.69133
1987	98.93178
1988	97.2472
1989	99.75561
1992	99.77685
1993	99.03795
2008	99.80116
2009	98.6753
2013	99.98985
2014	99.87975
2015	99.2581
2016	99.97225