Year	% of GDP
1981	52.8124798894779
1982	51.4831536112827
1983	46.0396632029745
1984	37.9824916857578
1985	32.6261618187653
1986	36.4237785387079
1987	34.1195450877292
1988	30.8615846038857
1989	34.7956197687358
1990	34.9745780490266
1991	32.7072843954385
1992	31.4293479334941
1993	30.1301362363682
1994	29.6461253629739
1995	27.5666102508428
1996	26.8320749985826
1997	26.7998453070481
1998	27.9969539123117
1999	25.8550456138933
2000	24.9161238491441
2001	23.8225621448807
2002	21.8594243518554
2003	22.8518930783269
2004	21.9713044732396
2005	22.7591504239853
2006	23.7276196202871
2007	21.019898498968
2008	20.9176532967288
2009	21.0170623762764
2010	18.0940220619742
2011	17.8009432879585
2012	17.5967747184748
2013	17.4359930887983
2014	17.7101075817425
2015	17.6407990187048
2016	17.1977993362698
2017	17.6081090158899