Year	% of total
1960	95.91280653950955
1961	95.57291666666667
1962	95.75596816976127
1963	94.93975903614458
1964	94.824016563147
1965	94.0630797773655
1966	94.3157894736842
1967	94.45471349353049
1968	95.89041095890411
1969	95.17684887459808
1970	95.2153110047847
1971	95.34534534534535
1972	95.12855209742895
1973	94.75655430711612
1974	94.98207885304659
1975	94.48491155046827
1976	93.24473975636766
1977	93.5576923076923
1978	93.78330373001775
1979	93.90625
1980	93.739837398374
1981	92.79112754158966
1982	91.30434782608695
1983	91.118800461361
1984	92.92604501607717
1985	92.50780437044746
1986	90.58473736372645
1987	82.55280073461891
1988	89.77777777777777
1989	89.2055267702936
1990	107.77061068702292
1991	107.0982382133995
1992	109.78223602484472
1993	99.46109589041097
1994	114.53465930018416
1995	103.48447244094487
1996	98.33957996768983
1997	105.92311450381679
1998	96.56285886610374
1999	98.65124390243902
2000	88.8332696390658
2001	90.34800203873597
2002	84.58266475644699
2003	82.00302656546489
2004	85.10851162790698
2005	83.08046875000001
2006	82.7066203301477
2007	80.31350523771152
2008	77.61381672597865
2009	85.13010126582277
2010	76.1583056768559
2011	75.3078109028961
2012	73.52108641975309
2013	70.38046887009992
2014	69.8175770609319
2015	64.56523255813954
2016	62.27179266895762