Year	% of total
1990	26.1562110470774
1995	6.88729939449764
2000	5.02580753807447
2005	5.82142832079895
2010	6.47601161388065
2011	6.16984936199787
2012	1.17870826630763
2013	0.263896000442954
2014	0.258944001487604
2015	0
2016	0
2017	0