Year	% of total
1990	2.32215784166381
1995	2.42135507705531
2000	1.86691989229817
2005	3.17430128833226
2010	2.91573088917831
2011	1.89621611452575
2012	0.827911683824478
2013	1.89301639592487
2014	0
2015	0.821669356045918
2016	0
2017	0