Year	% of GDP
1964	24.409143812869
1965	29.062213143847
1966	24.7268664073306
1967	27.9770883269547
1968	36.3702692162346
1969	41.9967066056124
1970	46.136180085295
1971	50.6768352409406
1972	55.7481446194871
1973	55.0299492122953
1974	37.6952136030839
1975	50.0598055100959
1976	57.0530270110366
1977	58.3122560645063
1978	69.4192220266862
1979	64.2622996748025
1980	61.599383933053
1981	58.6839075860718
1982	70.8723531323745
1983	78.2195122955321
1984	82.7268301328357
1985	84.9742486505822
1986	93.3415656980701
1987	95.225826764886
1988	99.3533577952531
1989	90.6305208251357
1990	78.4328891617029
1991	59.6274735572929
1992	55.4487682608516
1993	59.0258149082161
1994	47.2262149852672
1995	45.0405398097009
1996	38.3229960015854
1997	38.5912176890806
1998	41.3841709149183
1999	45.8193161179613
2000	28.2711307109127
2001	36.2669151442499
2002	37.8027884249769
2003	31.2351276104382
2004	21.6522068961258
2005	7.33790074468705
2006	3.64820200338359
2007	-3.63603837058901
2008	-12.6982675301
2009	-8.95341854553151
2010	-6.62664871583612
2011	-4.51411794102887
2012	-2.11152017674181
2013	3.00354398128098
2014	18.0025791020018
2015	39.9704794508598
2016	54.383172257668
2017	67.9220346106222
2018	72.7051568563944