Year	% of GDP
1974	14.7694098016408
1975	9.53769123170703
1976	12.6075008699631
1977	15.9697764495926
1978	14.0151654534368
1979	14.8600327891652
1980	16.639290255256
1981	17.9373186653772
1982	17.5617712101581
1983	18.9017928205913
1984	21.6842381205063
1985	20.9219337786302
1986	20.2456748941017
1987	19.9783866740835
1988	20.3847985867003
1989	22.6847697731231
1990	21.6312179663017
1991	20.7688836082271
1992	20.4860269476733
1993	20.8327478304813
1994	21.2143162814641
1995	26.6664629658394
1996	25.1108019969105
1997	26.2612910867404
1998	26.708996919313
1999	28.324981369841
2000	30.177718419953
2001	41.5784812776956
2002	43.8463232196472
2003	42.8476154986131
2004	45.0501442756735
2005	47.6626655655307
2006	50.1045569851636
2007	50.0246908101259
2008	51.5518651553997
2009	52.6484820411198
2010	57.4080354972116
2011	61.2842378400854
2012	60.0206762516017
2013	57.9223520150046
2014	60.0209098275594
2015	60.1635648659459
2016	61.4430019576263
2017	63.6693097613582
2018	64.0615001435472