Year	% of total
1990	99.9779858966768
1995	99.9764891095111
2000	99.9332445489956
2005	99.9710206115628
2010	99.9419047091092
2011	99.974097281867
2012	99.5927919996229
2013	99.4339210912998
2014	94.1081517348145
2015	57.7885662659322
2016	0
2017	0