Year	% of GDP
1970	0.32156851214177706
1971	1.0918165034212863
1972	1.2501584052743977
1973	1.9777541342799694
1974	1.63008443521968
1975	1.5367414130324155
1976	1.1763333283225599
1977	1.3902007573067552
1978	1.1202682800544135
1979	1.6637626741767448
1980	2.1495086926118767
1981	1.5986321834717858
1982	2.3405188710237623
1983	2.244107606464239
1984	1.6620212903675116
1985	1.8750542258404335
1986	2.163035360776197
1987	2.684854305484306
1988	2.5113942841632326
1989	2.5596070638374018
1990	2.340033697553948
1991	1.524544081167083
1992	1.8561678547001519
1993	2.0648642756151134
1994	2.0136021787033775
1995	2.157846414204076
1996	2.222559224512639
1997	1.5685105720391406
1998	1.7348636295614024
1999	1.4513074369998296
2000	1.2767077415515167
2001	1.3145191878037419
2002	1.3175407586633046
2003	1.6336847072803002
2004	1.2960534577045801
2005	1.5186124039086646
2006	1.7752478076885618
2007	2.347018641938857
2008	2.7727295107469203
2009	2.4375614641988173
2010	3.3053690147917165
2011	3.8230547909773884
2012	4.1025165293204395
2013	3.4428835286103228
2014	3.7142358237014568
2015	3.041852289078479
2016	2.706343090913008
2017	4.05687902140574
2018	4.0369708100504
2019	3.5457333370942727
2020	3.8707742893645953
2021	4.057990779207046