Year	% of GDP
1977	4.982919931411745
1980	4.840194940567015
1982	5.705175161361695
1989	4.3171000480651855
1996	4.185309886932375
2006	4.71720290184021
2007	4.730759859085085
2008	4.466135025024415
2009	4.83119010925293
2012	5.46478986740112
2015	4.53192400932312
2016	3.68754005432129
2017	3.5965099334716797
2018	3.68561005592346