Year	% of total
1960	94.38669438669439
1961	93.31848552338529
1962	93.20843091334893
1963	92.85714285714286
1964	93.33333333333333
1965	92.914653784219
1966	92.27272727272728
1967	92.5035360678925
1968	92
1969	82.6530612244898
1970	81.07876712328768
1971	86.8923611111111
1972	86.99122106943335
1973	81.3937282229965
1974	83.44370860927154
1975	86.90239043824701
1976	87.56781193490055
1977	85.15433610975013
1978	88.21667252901862
1979	87.43218806509945
1980	88.29787234042553
1981	90.92706502636203
1982	91.27376425855515
1983	91.69323082692668
1984	91.18509573917544
1985	88.60162294772597
1986	83.77340374459914
1987	88.01552644347404
1988	84.67091295116772
1989	84.40383571557808
1990	86.69164102564103
1991	82.643650990099
1992	112.43904125508423
1993	130.95779429987607
1994	62.57370522607164
1995	99.01641557128413
1996	92.84080924855492
1997	64.82259447983014
1998	82.5310265183918
1999	89.25039092664093
2000	81.14760411792231
2001	83.97148163962424
2002	90.0816659601526
2003	95.54708263772955
2004	97.08461841070024
2005	95.85524493554328
2006	84.38760906904844
2007	92.45600405679514
2008	95.33231175693527
2009	95.02765340733889
2010	90.1351774891775
2011	84.71286478873239
2012	70.51692055692055
2013	87.21563783920871
2014	92.66295388349515
2015	89.30657907662084
2016	87.81623686234299