Year	% of total
1990	88.2402044534353
1995	85.6765649961943
2000	84.7850975266509
2005	57.0752995588227
2010	50.2578261447567
2011	62.4039614190029
2012	83.6752796790267
2013	42.2380917536939
2014	61.2465203457396
2015	24.6275731334091
2016	12.8642785601994
2017	11.7757390992475