Year	% of total
1990	85.2422002990434
1995	84.923906134983
2000	83.819596605647
2005	55.6974831484517
2010	45.6400960535675
2011	41.4981760145121
2012	65.2715017331201
2013	46.4179587377594
2014	68.8384421578416
2015	95.9335096280525
2016	78.9002647681957
2017	83.8275542544778