Year	% of total
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	2.901818719503179
1985	3.759265546313586
1986	6.010678975255367
1987	4.0949807103632825
1988	6.694611389707665
1989	6.837727944800394
1990	5.108685793753968
1991	5.491496108388585
1992	5.569781178601199
1993	4.184908947225732
1994	5.3820494746715655
1995	6.096093990214746
1996	5.902373982435738
1997	6.087488086871973
1998	6.701518570710604
1999	6.404985480635858
2000	6.2597131405861335
2001	5.149082734072142
2002	5.486264892663019
2003	5.475939251366499
2004	5.547254389241688
2005	4.66546859184896
2006	3.9967949101259315
2007	4.344337811900192
2008	5.089249723112567
2009	5.188501509227559
2010	4.714238957638477
2011	5.2015594662064295
2012	4.689443064888805
2013	5.571266074757497
2014	5.529299998797455