Year	% of GDP
1960	36.152494916983
1961	35.4179098434364
1962	37.3250820771036
1963	40.5927615640879
1964	45.0727289216665
1965	45.5946230949889
1966	51.4091477213938
1967	48.0119581018696
1968	47.7655050017529
1969	48.1610540709385
1970	47.1957452315885
1971	51.1256193498833
1972	55.9676046764936
1973	48.8119485363034
1974	36.8512985757195
1975	36.9226983548791
1976	40.9150668992303
1977	44.5320465930927
1978	46.467156305711
1979	50.6561474722349
1980	48.7735633999882
1981	46.5918606673635
1982	49.4638746622248
1983	50.2397957333158
1984	49.9553511989281
1985	52.0567419846601
1986	55.5017447509813
1987	57.7860693180322
1988	53.116939969408
1989	51.3420000094304
1990	50.871165784265
1991	51.1761145945684
1992	55.9194943345691
1993	54.8955603913372
1994	51.6455395517024
1995	51.0232326506159
1996	54.3557426154875
1997	52.1164144654287
1998	51.4505392710568
1999	49.1276012037528
2000	41.6012108314069
2001	38.0854719370394
2002	37.2155348248483
2003	37.884092534982
2004	43.0185814224778
2005	46.4828512710119
2006	42.1963301591011
2007	45.4646460426681
2008	51.2344005437887
2009	46.6967126243116
2010	46.1867378320812
2011	42.708005921008
2012	46.2244456052748
2013	49.5110202914663
2014	47.4814107300327
2015	48.7629486514095
2016	52.3562277148463
2017	53.8619424543615
2018	58.2771734632291