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
2010	4.0507017374038705
2012	5.103449821472165
2015	4.66321992874146
2016	3.92226004600525
2017	3.73344993591309