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	1.9959720090364892
1985	2.5417510869465247
1986	4.041989049785015
1987	2.752154430709492
1988	4.479789770483404
1989	4.567542306979112
1990	3.3813978503549205
1991	3.608325223308162
1992	3.680831489953091
1993	2.786331071778992
1994	3.610874270725735
1995	4.068445273792529
1996	4.007492391362598
1997	4.150619733082973
1998	4.492429095221132
1999	4.191635080882396
2000	4.092803328745065
2001	3.2926244424462334
2002	3.45972113146792
2003	3.542582274070468
2004	3.5282999481392414
2005	2.930971724368607
2006	2.5016489228233363
2007	2.738711138506202
2008	3.182099964848463
2009	3.1742160423430144
2010	2.8175505767817652
2011	3.06346033640616
2012	2.7044919723537912
2013	3.129587158102134
2014	2.9878777595545563