Year	% of GDP
1997	0.1772522787110684
1998	0.33319660038717014
1999	0.2595719159309442
2011	0.4122990429891559
2012	0.40849903912261176
2013	0.15231430602691692
2014	0.38138494812423246
2015	0.6320321234661631
2016	0.6158639334318917