Year	% of total
1990	5.5701065130085565
1991	6.63840842277979
1992	2.425830445439946
1993	1.4259076450586816
1994	2.403846153846154
1995	3.0369262625100655
1996	3.2297044930242778
1997	2.7988717726187895
1998	3.121699331064429
1999	2.769714562167392
2000	7.001057206625161
2001	7.061181185901214
2002	6.203823149994136
2003	4.961118220297274
2004	4.726319875776397
2005	5.330720235178834
2006	5.5384299219071105
2007	2.821985233798195
2008	3.997731783385313
2009	1.230208451987698
2010	2.3372415921012033
2011	1.93903668657411
2012	1.0528954625219353
2013	0.6704331450094162
2014	0.554394986340993
2015	0.5951809542094653