Year	% of total
1990	9.070869613137882
1991	6.7280896320309385
1992	5.314469147544882
1993	3.511639704638972
1994	1.7135790837357203
1995	1.5446880269814502
1996	1.573496215642013
1997	2.084969653695109
1998	1.892941339620025
1999	2.3422168766221434
2000	1.558222783743946
2001	1.2237519121123628
2002	0.9018428963534177
2003	1.047913259434248
2004	0.9217148747801831
2005	0.7197191339964891
2006	1.3817537643932685
2007	2.17217331656568
2008	2.149006007307859
2009	1.346404417695601
2010	0.21296014602981442
2011	0.23401896785318388
2012	0.4359608813479439
2013	0.25708442886356997
2014	0.9713453132588635
2015	1.5266285980654934