Year	% of total
1990	1.51219488737462
1995	1.63293194115701
2000	1.58440728028204
2005	1.89711700136435
2010	2.22690827077107
2011	2.98588535647624
2012	1.86548772897914
2013	0.825134280573459
2014	0.177212099248936
2015	0.306158183103711
2016	0.0612062072149811
2017	0.0612123212817117