Year	% of GDP
1970	2.03858995437622
1971	2.49202990531921
1979	2.82277989387512
1980	3.26240992546082
1982	3.79268002510071
1984	5.97889995574951
1987	5.35174989700317
1992	2.98497009277344
1998	2.22585010528564
1999	2.92365002632141
2000	3.00160002708435
2002	2.39101004600525
2003	2.42200994491577
2010	4.48422002792358
2014	4.08329010009766
2015	4.07842016220093
2016	4.08115005493164
2017	4.35768985748291
2018	4.47399997711182
2019	4.59999990463257
2020	4.58199977874756
2021	4.08699989318848