Year	% of total
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0.10264988784549291
1985	0.11195700850873264
1986	0.08551881413911061
1987	0.07731352314363507
1988	0.07525741456573051
1989	0.013522193299753219
1990	0.05978337318891546
1991	0.08009878850582385
1992	0.14517910683288623
1993	0.11848701200060763
1994	0.13426823810234223
1995	0.1646187312599212
1996	0.14249073810202337
1997	0.1497302031245586
1998	0.16133369185264856
1999	0.17181222245717911
2000	0.1847063169560399
2001	0.19497459837978856
2002	0.11892579583483143
2003	0.48323326987845955
2004	2.1686246588346982
2005	4.664951336838572
2006	3.644831144203687
2007	4.186686686686687
2008	5.356652092442224
2009	7.427314247521444
2010	7.578068555832063
2011	6.901912879313696
2012	7.024686011260285
2013	8.500033009836931
2014	9.659090909090908
2015	9.811482433590403