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	1.4298831504928045
1981	1.5235007744686693
1982	1.4703521537382789
1983	1.1770151660324466
1984	1.254632012408123
1985	1.2552340305493714
1986	0.7602064046765618
1987	2.1408377871020328
1988	4.670920292188317
1989	6.920263073570514
1990	8.820035996592201
1991	4.612811042729747
1992	5.340027446399489
1993	4.883352464774809
1994	4.400752970000489
1995	5.08528237490788
1996	5.551251261639594
1997	4.708060883963983
1998	1.6735913705268248
1999	3.647905912911373
2000	7.9937177133507795
2001	8.551785819568146
2002	7.396815459443393
2003	7.3599484564498665
2004	7.858661206832016
2005	8.534315893191058
2006	9.672692701374258
2007	8.85407864587422
2008	11.300091156580738
2009	7.852955901065216
2010	8.603763954520044
2011	11.023662506021868
2012	9.634111127660853
2013	8.471160121924777
2014	7.801843152009989
2015	5.1073376329138185
2016	4.413887123664454
2017	5.801606407998629
2018	8.320709872485748
2019	6.71418173686971
2020	4.131759083031968
2021	10.150863865124425