Year	% of total
1990	2.60755095441558
1995	2.60807124205589
2000	1.35137030335008
2005	1.32210336435618
2010	0
2011	0
2012	0
2013	0
2014	0
2015	1.26391262649848
2016	1.25801896240424
2017	1.25213209118987