Year	% of total
1960	96.77419354838709
1961	97.5
1962	97.7777777777778
1963	98.21428571428571
1964	97.79411764705883
1965	99.2248062015504
1966	98.23008849557522
1967	99.29577464788731
1968	98.85057471264369
1969	99.43820224719101
1970	99.44751381215468
1971	100
1972	100
1973	99.54545454545453
1974	100
1975	100
1976	100
1977	100
1978	100
1979	100
1980	99.64157706093191
1981	99.67948717948717
1982	95.25139664804469
1983	86.02941176470587
1984	81.72043010752688
1985	58.71559633027523
1986	77.77777777777779
1987	77.86561264822134
1988	72.49544626593807
1989	68.41216216216216
1990	67.6498275862069
1991	72.51036199095023
1992	76.21276497695852
1993	73.20950177935943
1994	79.3299203187251
1995	88.4394117647059
1996	93.88784482758619
1997	99.02384615384616
1998	90.51455696202532
1999	97.38091286307055
2000	99.33610328638497
2001	99.84843373493976
2002	99.10383620689655
2003	98.91065134099618
2004	99.009
2005	103.01190839694657
2006	97.14090566037736
2007	100.53804428044282
2008	94.10169117647058
2009	98.7606374501992
2010	99.20798449612403
2011	99.165953307393
2012	98.91428044280444
2013	99.02447257383967
2014	99.86723404255319
2015	98.23115151515151
2016	99.41644444444445