Year	% of total
1990	0
1995	2.43814882719614
2000	2.64491135126436
2005	3.57320213487863
2010	3.63088429960488
2011	7.25645907118037
2012	4.15895485536217
2013	0
2014	0
2015	0.440949032565263
2016	0
2017	0