Year	% of total
1971	50.326797385620914
1972	62.251655629139066
1973	62.37623762376238
1974	42.857142857142854
1975	30.14705882352941
1976	36.134453781512605
1977	26.923076923076923
1978	27.54237288135593
1979	64.15094339622641
1980	25.49019607843137
1981	28.30188679245283
1982	26.923076923076923
1983	65.45454545454545
1984	74.32432432432432
1985	31.53153153153153
1986	28.971962616822427
1987	31.53153153153153
1988	36.134453781512605
1989	25.78125
1990	39.87341772151899
1991	31.802120141342755
1992	23.353293413173652
1993	20.415224913494807
1994	40.08097165991903
1995	17.475728155339805
1996	20.168067226890756
1997	35.41666666666667
1998	42.857142857142854
1999	51.86915887850467
2000	42.857142857142854
2001	59.34959349593496
2002	42.76315789473684
2003	29.545454545454547
2004	55.376344086021504
2005	59.78835978835979
2006	57.466063348416284
2007	47.95918367346938
2008	24.390243902439025
2009	25
2010	45.81005586592179
2011	13.28125
2012	15.315315315315313
2013	18.27956989247312
2014	13.793103448275861
2015	24.691358024691358