Year	% of GDP
1974	0.649569629708067
1975	0.27560848287554895
1976	0.3929248543065803
1977	0.39121377641447486
1978	0.4532671289321985
1979	0.40930024041683594
1980	0.29905485384361224
1981	0.26733700121549814
1982	0.3269993377793057
1983	0.37973942260747023
1984	0.3712122751383743
1985	0.4355615032967137
1986	0.5231668271401025
1987	0.5200639894680766
1988	0.5347185184907106
1989	0.8548951116699189
1991	2.193856060302801
1992	4.086152065188042
1993	9.430816265067786
1994	12.783701763974758
1995	15.12857447785427
1996	11.996414362774201
1997	6.1952745126644455
1998	12.794918859230247
1999	11.512146817145332
2000	7.054167015746129
2001	6.457120195661169
2002	5.2100604250463265
2003	7.351632369192313
2004	9.660679934952993
2005	11.771716432980963
2006	13.221134102436555
2007	13.439881596400463
2008	14.720928126676702
2009	18.05911133276999
2010	20.522455806260265
2011	22.252839253301346
2012	19.53616881329343
2013	21.05233857309676
2014	19.086921410877906
2015	20.740293464391346
2016	18.093497461523068
2017	20.063967196597364
2018	20.478832998901726
2019	19.552740020051836
2020	20.927166672321544