Year	% of GDP
1971	25.49963530269876
1972	24.32672764227642
1973	24.040865123356156
1974	25.6973293768546
1975	23.261327713382506
1976	24.64909767974792
1977	24.924886530716613
1978	25.194585448392555
1979	24.879203710862
1980	24.856763264967203
1981	26.036552100381886
1982	26.623063475797217
1983	25.883370731839193
1984	25.753260739499822
1985	23.127940475450266
1986	21.41390437078322
1987	19.39044582081315
1988	18.74189087072444
1989	18.620977739449145
1990	17.7900088010824
1991	17.86433583003146
1992	17.9128103657369
1993	17.937924918711204
1994	18.454746136865342
1995	17.700236917577623
1996	16.65957804571666
1997	16.321137241806994
1998	15.784546833167957
1999	15.556085455139584
2000	15.504134714074716
2001	15.189725899683012
2002	15.551741738853833
2003	14.718135389129564
2004	14.556253598949267
2005	14.525245953957663
2006	13.31015557777726
2007	12.326367498245595
2008	12.41143363990581
2009	10.769555394298713
2010	10.844291882641068
2011	10.944467915317091
2012	10.607648946637608
2013	10.235527090125732
2014	11.069678902673683
2015	11.279693966648003
2016	10.09039752060938
2017	10.194548781662332
2018	9.946990753593557
2019	9.674843302638706
2020	9.392912022244445
2021	8.811161120127608