Year	% of GDP
1974	8.558810469340495
1975	9.230522879881248
1976	9.380134623105679
1977	8.856840729455902
1978	9.542171521567328
1979	9.955960848408804
1980	9.482800952704435
1981	9.672412839248171
1982	9.635126840249832
1983	9.647614646349828
1984	9.72859241759741
1985	10.313611191573374
1986	10.750048276105733
1987	10.411415391457162
1988	10.659078205490992
1989	10.811169007516751
1990	10.284874377800266
1991	10.425313656644363
1992	10.06415762336482
1993	8.840152803712506
1994	9.26436305529917
1995	9.533509450441665
1996	9.506977910162572
1997	9.618492511887414
1998	8.81393869220347
1999	9.310799847598828
2000	8.86525417618952
2001	8.18722566659978
2002	8.693628977019669
2003	9.051146841746032
2004	9.490942898467866
2005	9.957285114536417
2006	10.858417002410098
2007	11.681291583947536
2008	10.740940099274557
2009	9.731409662162442
2010	10.222705387527537
2011	10.089548205492182
2012	10.657118565219454
2013	10.803101377409442
2014	9.899276577754785
2015	10.473356484848852
2016	10.902836335301634
2017	11.114297079366358
2018	11.732826921220022