Year	% of total
1990	100
1995	100
2000	100
2005	96.0688940307877
2010	96.2839384084648
2011	96.3265199830322
2012	96.368915377349
2013	96.4112898346446
2014	54.3937641741456
2015	100
2016	100
2017	100