Year	% of GDP
1971	3.5048450231552097
1972	3.920114874839785
1975	4.334905028343205
1980	3.9660298824310303
1983	3.82118511199951
1984	3.91366493701935
1989	4.342339992523195
1992	4.4134500026702845
1994	6.148569822311405
2004	2.79530000686646
2005	2.65651988983154
2009	4.01999998092651
2010	4.81548976898193
2011	4.88906502723694
2012	5.2621049880981445
2013	5.049499988555905
2014	5.21526503562927
2015	5.04925012588501
2016	5.41499996185303
2017	4.96308994293213
2018	3.03096008300781
2019	3.86800003051758
2020	4.61899995803833
2021	3.3244999647140503