Year	% of total
1990	99.66934458409764
1995	99.66391035459354
2000	99.59312986039149
2005	99.84548180490647
2010	99.50418551781053
2011	99.71575334333592
2012	99.9080613484724
2013	99.15643544904772
2014	99.1223891944588
2015	99.37478153458235
2016	99.1266532380205
2017	99.08046037387265