Year	% of total
1990	97.8855998112908
1995	98.6939397896054
2000	99.2328377517233
2005	99.4677627183082
2010	97.3655804255452
2011	99.6948091148479
2012	97.2851654861921
2013	97.8116242787888
2014	71.6883853722485
2015	60.9376349416121
2016	36.9352176458383
2017	34.8078142429364