Year	% of GDP
1960	17.2494586157028
1961	17.8117957900631
1962	19.311791399816
1963	21.7101048583807
1964	24.6986363307064
1965	25.7489554559518
1966	27.9662243620843
1967	30.3544599935075
1968	31.7803625498553
1969	31.28219628755
1970	26.327922283005
1971	30.069223258733
1972	28.6763742632937
1973	20.7427291180258
1974	10.5614920463574
1975	15.3017373065787
1976	19.1451838510045
1977	25.3055287265199
1978	29.0731201903126
1979	26.9967986647834
1980	27.1817913425001
1981	17.247790574689
1982	22.5997560873593
1983	29.0155589422325
1984	27.7096670073691
1985	27.7818218519481
1986	31.8991147627873
1987	32.0323565935194
1988	32.3294280452046
1989	32.0508037488922
1990	29.4847293312488
1991	32.1781719227205
1992	36.0043753824295
1993	38.2811669360331
1994	37.464442978345
1995	34.4304638509558
1996	32.354445505732
1997	31.8119907795749
1998	32.2767138086453
1999	30.3190196552849
2000	25.7906175084715
2001	26.4691529611864
2002	27.6300865199884
2003	26.4360171114694
2004	23.6752133265094
2005	22.1150857890789
2006	18.2946702609614
2007	23.4695842096985
2008	26.9656193994517
2009	29.3395634095378
2010	27.3332823990322
2011	28.4909864608052
2012	28.7666141063036
2013	30.6145310393649
2014	30.1640492556174
2015	33.0725947933581
2016	37.4263407058086
2017	37.0887392147419
2018	37.3667193752016