Year	% of GDP
1961	12.962553966737742
1962	12.15753354735278
1963	12.626385912250209
1964	12.825943677629168
1965	13.644332234226987
1966	14.185095157424573
1967	14.31285133091931
1968	15.469295503415102
1969	16.411315147476685
1970	16.37972343446631
1971	15.834898784401185
1972	17.70103511830349
1973	17.887978108212604
1974	13.801822384135006
1975	17.178294253478782
1976	17.75692982111758
1977	19.252020947658085
1978	21.52301126409317
1979	22.23034661809964
1980	20.913415726678082
1981	22.198164464941815
1982	24.626891457823216
1983	27.4505137360467
1984	28.744002400698488
1985	28.99063629875977
1986	33.000047098559286
1987	34.6667209182769
1988	36.33904184592469
1989	35.05950960162392
1990	28.7875583307285
1991	28.283524087939032
1992	25.292871117143832
1993	26.432393329884835
1994	28.36454828319776
1995	30.136409246698793
1996	29.556709059982687
1997	32.41421775324994
1998	37.52321667406324
1999	37.82845023303174
2000	37.577918555635456
2001	39.89247928622395
2002	40.358025848265584
2003	39.135809596677056
2004	38.19123696481311
2005	39.5217162471582
2006	39.98237729798867
2007	42.50830885339216
2008	43.34869896688032
2009	49.0217797161748
2010	45.95727362643665
2011	42.735446390022126
2012	41.71549106212243
2013	42.07164967214755
2014	45.66527235767788
2015	54.29507301386078
2016	57.34642531710442
2017	54.91936556377056