Year	% of total
1971	3.907380607814761
1972	3.9318479685452163
1973	2.5578562728380025
1974	2.127659574468085
1975	2.965235173824131
1976	1.465201465201465
1977	1.595298068849706
1978	1.9308125502815767
1979	1.791044776119403
1980	1.9502353732347006
1981	1.8637992831541221
1982	1.997422680412371
1983	2.029850746268657
1984	1.5343915343915344
1985	1.9820670127418596
1986	2.271714922048998
1987	1.7241379310344827
1988	1.6621743036837375
1989	1.483560545308741
1990	1.6142050040355123
1991	1.867762420620097
1992	0.16688918558077437
1993	0.14771048744460857
1994	0.13912075681691707
1995	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0
2002	12.647987371744277
2003	11.68663594470046
2004	7.220538420395793
2005	9.790558510638297
2006	12.751460090850097
2007	13.361462728551334
2008	9.272123225611598
2009	6.792073520964963
2010	8.895664854832294
2011	7.336846372111877
2012	7.18412225121133
2013	4.646035763860537
2014	2.0202020202020203
2015	1.7845961177207263