Year	% of total primary
1981	0
1982	0
1983	0
1984	0
1985	0
1998	5.22377014160156
2007	0
2008	1.99437999725342
2009	1.93709003925323
2010	1.94600999355316
2011	3.0025999546051
2015	14.1185598373413