Year	% of total
1990	3.31894131233447
1995	3.18111390428194
2000	2.84553574949955
2005	0.00433810697991753
2010	0.00337231498427356
2011	0.00334505294915536
2012	0.00331766681208587
2013	0.000892768564841898
2014	0.00324587242556119
2015	3.33004132121894
2016	2.64198022649299
2017	2.76632621400984