Year	% of GDP
1970	3.928647965343816
1971	2.361566216223278
1973	3.8149318318047434
1974	4.224218898790528
1975	1.5244539308369283
1976	1.5767237334439572
1977	1.6078342878171998
1978	0.8542890195710539
1979	1.3476413322925311
1980	1.530501814853076
1981	0.8263592833305285
1982	0.5844650549648968
1983	0.6802484793732101
1984	0.5380558822259576
1985	0.5183304210997977
1986	0.7566660993600429
1987	0.7200628115740674
1988	1.2032288796036836
1989	1.4157551343165609
1990	1.006355017796152
1991	0.5957440558733837
1992	0.6530727318868248
1993	0.5688435771071787
1994	0.7572608672317603
1995	0.4472887720909524
1996	0.5140637156523657
1997	0.42972449121522993
1998	0.32247295144187194
1999	0.28312551536953345
2000	0.34816810738083703
2001	0.37755080874512537
2002	0.4109532428763762
2003	0.2871206877008111
2004	0.45560766351927867
2005	0.7443663984813181
2006	1.5469950774095707
2007	1.5784885097773278
2008	1.4571947136096883
2009	1.3224913123847528
2010	2.114347590241893
2011	2.9931674513598696
2012	2.5586985410234986
2013	2.021964909635986
2014	1.5774619070274214
2015	0.9404523608400759
2016	1.090750786453631
2017	1.5407910026801999
2018	1.4472644562813204
2019	0.9971561955599054
2020	1.37525379300989
2021	5.088314955249147