Year	% of total
1990	100
1995	100
2000	100
2005	96.1865500738064
2010	95.0869876358265
2011	97.1494318290236
2012	97.6451968722053
2013	94.3277672471148
2014	95.5636444771552
2015	99.9721267374385
2016	99.9389708002973
2017	99.9399274153524