Year	% of total
1960	23.151750972762645
1961	38.99721448467967
1962	18.81918819188192
1963	13.024282560706402
1964	33.04794520547946
1965	31.261425959780624
1966	40
1967	34.05088062622309
1968	41.556728232189975
1969	44.68325791855203
1970	41.646191646191646
1971	48.275862068965516
1972	49.66666666666666
1973	47.73662551440329
1974	45.16880093131548
1975	47.64930114358323
1976	43.98280802292264
1977	63.378378378378386
1978	71.5561224489796
1979	71.70596393897364
1980	72.57142857142857
1981	64.06480117820324
1982	67.67676767676768
1983	65.12059369202227
1984	63.72315035799523
1985	66.77316293929712
1986	78.35820895522389
1987	79.47761194029852
1988	79.71014492753623
1989	80.28169014084506
1990	73.99482142857143
1991	86.99372340425532
1992	75.67354545454546
1993	70.49736434108527
1994	79.67390909090909
1995	79.92179487179487
1996	82.19137931034483
1997	78.74100775193799
1998	82.80322580645161
1999	87.94837398373984
2000	84.8795104895105
2001	102.46794326241135
2002	85.01834394904458
2003	84.47539267015706
2004	85.81931937172774
2005	84.06222222222222
2006	81.62032258064515
2007	82.54860986547085
2008	78.08745535714287
2009	78.30725099601594
2010	77.7889338235294
2011	75.8610625
2012	75.4900325732899
2013	91.35705202312138
2014	123.62794183445189
2015	62.417021276595754
2016	97.15333333333334