Year	% of total
1990	1.8348623853211
1995	1.8348623853211
2000	63.302752293578
2005	62.3853211009174
2010	62.3853211009174
2011	71.5596330275229
2012	45.8715596330275
2013	32.1100917431193
2014	15.5963302752294
2015	14.6788990825688
2016	3.6697247706422
2017	3.6697247706422