Year	% of total
1990	2.5365470185392
1995	0.929522190398335
2000	0.796000879472158
2005	0.050626694387923
2010	0.00341583459493315
2011	0.00493617975558805
2012	0.02959952902577
2013	0.091259003691102
2014	0.00642573744795709
2015	0.0421709078359255
2016	0.00334082970782081
2017	0.00528204094669695