Year	% of total
1990	91.1390847523653
1995	89.5804588905897
2000	88.2474263818387
2005	88.6541863617548
2010	87.5024347222583
2011	90.3821512983428
2012	84.7873426670964
2013	82.4165941402516
2014	72.0666771997428
2015	71.9634942035637
2016	67.1006731271173
2017	66.5332490328298