Year	% of GDP
1981	43.1474936938364
1982	47.4011638689913
1983	51.8543010820712
1984	57.2409837754977
1985	60.8223044251151
1986	58.8389539281044
1987	58.4778685926553
1988	61.5763765294053
1989	60.579168246732
1990	56.4047731044426
1991	66.9904780250613
1992	61.7414683276974
1993	57.5200880681718
1994	59.663838138065
1995	62.4704577338432
1996	63.0552718918433
1997	61.0041398370215
1998	63.3121724599836
1999	57.6080313197676
2000	51.4447736583704
2001	57.6408119274509
2002	61.3303019762288
2003	64.3758576578956
2004	60.04158738825
2005	59.4692664425005
2006	55.9984518381913
2007	60.3272142309176
2008	56.8210750391457
2009	64.590388510156
2010	61.3421873354122
2011	59.895878249757
2012	59.4625898187076
2013	64.8082912985063
2014	65.2951487115565
2015	68.9264144866115
2016	71.7505614384215
2017	70.2083233647487