Year	% of total
1990	83.4055575466791
1995	84.3654661729512
2000	89.8168301152672
2005	77.4844165887647
2010	85.458456172196
2011	93.2619073538502
2012	60.5084303300629
2013	55.3899443443635
2014	28.7357806063166
2015	26.4441570195712
2016	22.3952430687433
2017	22.3857446597034