Year	% of GDP
1977	64.5161111183113
1978	63.2453381687752
1979	73.0359841156841
1980	76.8805472365629
1981	64.8614550902304
1982	66.6482502486921
1983	65.8821431442079
1984	63.5383079862142
1985	61.0122348857929
1986	63.647001557658
1987	64.8177399319728
1988	67.8958886064149
1989	75.3934676142836
1990	63.3480333324001
1991	60.7740829021569
1992	58.1710730028578
1993	56.9045669702034
1994	58.7587281068746
1995	55.2235529543335
1996	56.1974887326817
1997	65.8332081974144
1998	66.6492461737698
1999	61.4176119874681
2000	50.5904398864311
2001	48.7069183427768
2002	46.5093285920378
2003	50.1015622537719
2004	52.1472926763643
2005	52.8742190312982
2006	53.3372524743847
2007	58.7505098065487
2008	61.9498631779516
2009	57.4945479335432
2010	57.1322910693526
2011	55.6993965761759
2012	58.0286362690549
2013	58.4251225890075
2014	61.0292326465369
2015	54.2550422432242
2016	58.0132811494628
2017	55.2343241091631