Year	% of total
1990	99.3852020831305
1995	97.6340073180681
2000	97.1318118945742
2005	94.9381129528546
2010	87.1471064248594
2011	97.9045961849021
2012	87.7382913248458
2013	79.2158421137422
2014	78.6032065287319
2015	77.2524584914066
2016	64.7042825047498
2017	67.0107633315547