Year	% of total
1990	8.86026635074038
1995	8.71065918925281
2000	10.7523263246477
2005	10.2826206003298
2010	9.81955068968898
2011	9.77603573456188
2012	4.47260643839101
2013	0.352390197342067
2014	0.350996257610459
2015	0.349574373935346
2016	0
2017	0