Year	% of GDP
1970	0.24581835627307513
1971	0.2090092256410637
1972	0.27285363937490015
1973	0.35375886849781885
1974	0.2731950252089526
1975	0.3707950625600088
1976	0.4399966545341234
1977	0.24436205475265663
1978	0.3752071349524456
1979	0.3236479379068405
1980	0.44135275256827466
1981	0.7389513379349683
1982	0.4870553091815746
1983	0.3060076510624842
1984	0.3993241268783271
1985	0.40546278549382475
1986	0.7003772321707227
1987	0.9859382880746601
1988	1.4227961456601985
1989	1.9018133018004881
1990	2.7437769325518993
1991	1.8854626387004314
1992	2.2311645036749694
1993	1.557625502819411
1994	1.7531169974247922
1995	0.9881339114714817
1996	1.8908622041408956
1997	2.4425549179120054
1998	3.040444329874229
1999	8.400110651524606
2000	12.711712067563264
2001	6.342139084635733
2002	3.5301782973357643
2003	2.8513110808136033
2004	2.8836190537602993
2005	5.4073913782634415
2006	5.621098683646678
2007	4.969835145944444
2008	4.6411308406396925
2009	3.2847888882078173
2010	2.743114524208419
2011	2.250604786384351
2012	1.9381944059288292
2013	0.626465435079288
2014	1.8590431505384069
2015	2.10031983479992
2016	3.0184371226179265
2017	1.8715871187128448
2018	4.986679055775517
2019	3.09152973292825
2020	1.0759740640531696
2021	3.6795712722081264
2022	4.273299333465902