Year	% of GDP
1970	0.6915084968702375
1971	0.6602877830367473
1972	0.580501952483688
1973	0.7826910762075766
1974	1.1813573206541126
1975	0.9165910089112335
1976	0.9358808344641548
1977	0.8198770070228909
1978	0.8112071871374137
1979	0.8441030578896079
1980	1.3100316385048605
1981	1.400084441148026
1982	1.2957989821564841
1983	1.0923751145063578
1984	1.2439262511591678
1985	1.1549016697496155
1986	0.7478910891245609
1987	1.9132535605903351
1988	1.442047920618291
1989	1.6249944092956599
1990	4.322572979132295
1991	2.606928126963976
1992	2.7423829446121557
1993	2.4457169037946596
1994	2.324541079769094
1995	2.47848919128972
1996	2.673874809972589
1997	2.2243761769253947
1998	0.6927271524991887
1999	1.3672843966237882
2000	3.3078548998591533
2001	4.372970032839927
2002	3.659015565917681
2003	3.4313510482772545
2004	3.867468016773282
2005	4.362478353021026
2006	5.4787470110335414
2007	5.627317805416237
2008	7.8221874011498205
2009	5.103245338577616
2010	5.8978727570920695
2011	7.744142141648691
2012	6.517180902919412
2013	5.601548965919433
2014	4.939520220728392
2015	2.8923584768730497
2016	2.618523277202094
2017	3.713516286580012
2018	5.473222976279321
2019	4.4211090767917725
2020	2.9512731258626212
2021	6.927754867708757