Year	% of total
1990	17.0337516232448
1995	10.4672759920759
2000	5.15051190078506
2005	2.63854877448714
2010	3.44472753636351
2011	5.30504359791384
2012	0.171638271256491
2013	0.156993182988341
2014	0
2015	0.14998225380709
2016	0
2017	0