Year	% of GDP
1973	9.913934832538313
1974	11.746861310310601
1975	8.601477965864502
1976	10.908356565797277
1977	12.149937855643605
1978	11.32634042279003
1979	12.974940156078027
1980	12.783591120598542
1989	13.481524241290494
1990	10.84226199042493
1991	10.89006258179508
1992	10.569057977367674
2014	18.252415793969217
2015	18.942870563095305
2016	20.024073106334576
2017	19.79253467911193
2018	20.422734065883485
2019	20.74108071309824
2020	21.38185728193524