Year	% of total
1990	0.26588479508608
1995	0.610522740429986
2000	2.52617997505578
2005	19.1353457765905
2010	20.0644742343417
2011	8.37670485398423
2012	4.9617512452681
2013	4.9686317273264
2014	2.70564384932783
2015	1.33979640755122
2016	0
2017	0