Year	% of total
1990	7.33172636267267
1995	5.59515423477668
2000	3.27952731047597
2005	3.93154367220913
2010	3.75396016571226
2011	3.51025241842611
2012	0.210732962603821
2013	0.171159769484064
2014	0.0912027401800408
2015	0.0911076745403805
2016	0
2017	0