Year	% of total
1960	99.47368421052632
1961	99.64973730297724
1962	96.30156472261737
1963	96.65587918015102
1964	96.73267326732673
1965	95.5072463768116
1966	68.47826086956522
1967	92.08633093525181
1968	94.45196211096075
1969	95.57251908396948
1970	97.94603302456706
1971	98.05524861878453
1972	97.6916735366859
1973	97.51166407465008
1974	97.52962777499583
1975	97.29568205587928
1976	97.71700647051642
1977	97.56476683937824
1978	97.92127377266698
1979	98.11186681555174
1980	96.86187587494166
1981	95.75252663206774
1982	95.46407001109331
1983	95.47359597652975
1984	95.72949829838622
1985	96.89454625260618
1986	97.36180904522612
1987	97.53655793025871
1988	97.66402600040627
1989	97.86395867985641
1990	146.33452220726784
1991	141.34767337807605
1992	144.49210689869483
1993	125.5042279903666
1994	144.73622833843015
1995	95.56081275720165
1996	112.9723030607125
1997	136.21744556962025
1998	116.3227612529613
1999	121.09583571614245
2000	107.38333255049317
2001	106.81753252898037
2002	97.87530577713319
2003	54.30460491889063
2004	41.2051590106007
2005	47.671
2006	45.80543718052193
2007	13.484293549229564
2008	54.74729828214472
2009	111.71931496265775
2010	98.49280122612592
2011	67.11502792048248
2012	72.76926070038911
2013	78.83382058287796
2014	76.2597435897436
2015	84.14757582417582
2016	34.342376516464476