Year	% of GDP
1973	20.4120879120879
1974	18.9165763813651
1975	24.8820086841608
1976	22.1078431372549
1977	22.1978021978022
1978	30.8604970650681
1979	26.8247541931752
1980	22.1967963386728
1981	15.1430376319827
1982	14.58734746307
1983	13.7299939965201
1984	13.0432243787762
1985	13.3425883078822
1986	12.2293340596486
1987	15.3878535073285
1988	18.1218877320054
1989	20.2497611833955
1990	20.1178777140491
1991	16.9979923428415
1992	17.1586335578581
1993	12.977425367656
1994	26.7736587644453
1995	14.8170307602452
1996	9.74970768955805
1997	9.31543491522877
1998	11.0960709039779
1999	12.6065066315051
2000	12.3221032437236
2001	13.7991072559315
2002	10.3097554957451
2003	10.6827456385167
2004	12.2503965652352
2005	15.2079586902598
2006	17.719254869541
2007	21.1950810247027
2008	21.5340268923117
2009	22.5589857254546
2010	21.015312723066
2011	10.6119333126666
2012	12.0494054442508
2013	12.7024580393953
2014	11.9855600999476
2015	12.2216244181233
2016	10.7802797933837
2017	13.4322200241966