Year	% of total
1990	2.08266193037222
1995	0.407027364145973
2000	0.760649111460621
2005	0.857765650324815
2010	0.766856064755217
2011	0.954382243812235
2012	0.0957472118525149
2013	0.0982652845434529
2014	0
2015	0.104123111885068
2016	0
2017	0