Year	% of total
1990	32.3596815031094
1995	33.6999507349159
2000	43.4420220228816
2005	18.3949929334049
2010	45.3708068637822
2011	64.6366025194104
2012	50.8249537435942
2013	14.7143122565611
2014	3.95000640877847
2015	3.81900792040637
2016	3.11018987120473
2017	3.07658883258179