Year	% of total
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	1.4598540145985401
1970	14.102564102564102
1971	20.32085561497326
1972	24.30939226519337
1973	2.402402402402402
1974	2.0316027088036117
1975	3.0000000000000004
1976	1.1869436201780414
1977	0
1978	1.1363636363636362
1979	1.0526315789473684
1980	0.9009009009009009
1981	0
1982	0.2724795640326975
1983	0.3205128205128205
1984	0.3215434083601286
1985	0.5730659025787965
1986	0.3436426116838488
1987	0.27700831024930744
1988	0.24449877750611243
1989	0.24330900243309003
1990	0.4365476190476191
1991	0.11905844155844156
1992	3.411162790697674
1993	6.745317725752509
1994	7.254856115107914
1995	6.8834470989761085
1996	7.203035714285715
1997	7.575538922155689
1998	7.833529411764706
1999	9.322881355932203
2000	8.334090909090909
2001	0
2002	0
2003	1.1225510204081632
2004	1.2821678321678323
2005	0.9129460580912862
2006	0.888969696969697
2007	0.7862962962962964
2008	0.8811645101663585
2009	1.9548345588235296
2010	3.9026305220883533
2011	5.809855967078189
2012	8.569199999999999
2013	14.484649999999998
2014	12.852475490196078
2015	15.243633720930234
2016	14.558537313432836