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	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0.15257660689713845
1994	1.264968703243204
1995	1.006171420246371
1996	1.0419647983208187
1997	0.9925580975546408
1998	0.9468001755532603
1999	0.9471080071472263
2000	0.9728703749124376
2001	0.9350118962636702
2002	1.2161122328820282
2003	1.8427692563489966
2004	1.8864358699425603
2005	1.7711339541732662
2006	1.6174811796707205
2007	1.6185336356770368
2008	1.6903612648731212
2009	1.6194907234410545
2010	1.5181981361259562
2011	1.5986865677304556
2012	1.6986033979250228
2013	1.793876697383196
2014	2.04067432855209