Year	% of total
1990	5.370036101083032
1991	8.841247342310417
1992	2.5299947835159102
1993	10.423037716615697
1994	16.77927927927928
1995	10.50515204825333
1996	20.601407549584135
1997	4.4607190412782955
1998	5.261342073486286
1999	8.710462287104622
2000	2.5870406189555126
2001	2.219626168224299
2002	3.49685534591195
2003	2.0628930817610063
2004	1.2795905310300704
2005	0.12229922543823889
2006	0.10222858311183806
2007	0.3563194298889122
2008	0.037921880925293895
2009	0.07182618064284432
2010	0.03017956843217142
2011	0.016409583196586804
2012	0.016215339711366954
2013	0.03221130616846513
2014	0
2015	0.018073377914332188