Year	% of total
1990	33.9995805658833
1995	24.289509636329
2000	18.4046341040711
2005	19.0254147439945
2010	13.4589879659774
2011	28.7135904678379
2012	13.918119054491
2013	5.38236338344817
2014	3.51733021602346
2015	4.41205598574357
2016	0
2017	0.235993227759768