Year	%
1972	84.03177
1974	92.36984
1975	77.68541
1976	69.92464
1977	86.56856
1978	94.10618
1979	92.42954
1980	95.75422
1981	92.51496
1982	99.56201
1983	85.79985
1991	90.5911
1992	95.65064
1993	96.57904
2002	90.17261
2003	97.88996
2004	96.9837
2005	99.38296
2006	99.18352
2007	99.66443
2008	99.49258
2009	99.62595
2010	99.94546
2011	99.60396
2012	99.74107
2013	99.72625
2014	99.38369
2016	99.73679
2017	99.80164