Year	% of GDP
1966	12.0221192567782
1967	14.6865061335756
1968	13.8727964909377
1969	13.825995968129
1970	16.4025774456047
1971	19.8962827093239
1972	20.0558729736912
1973	21.9775076853012
1974	23.4091307627039
1975	26.7931143979276
1976	25.7151616675839
1977	24.8778095596537
1978	30.6662250637889
1979	30.7945001271041
1980	30.1059035551375
1981	32.6751037176675
1982	37.0953050356068
1983	32.5957623961354
1984	32.0768205600969
1985	31.9137738862549
1986	34.9268683197961
1987	37.4662390540434
1988	35.4245818126519
1989	32.7226600906598
1990	35.8166174640795
1991	37.3817847854277
1992	37.2643935955612
1993	29.0561270824766
1994	36.2259435735925
1995	42.7460812733706
1996	34.3078548977147
1997	37.1039956096807
1998	36.631186478211
1999	37.6540923576536
2000	35.7460691447274
2001	36.4135605959444
2002	38.9786529633378
2003	38.9739407654566
2004	39.3795895357871
2005	37.3608414974172
2006	32.0027627695636
2007	31.0930454476429
2008	33.9025229302558
2009	35.5769634327343
2010	41.0804682318243
2011	41.6782172967907
2012	42.2370027734099
2013	43.755051531937
2014	44.7443385013271
2015	45.212361867811
2016	43.6061451496723
2017	40.5585184775161
2018	39.0547984827737