Year	% of GDP
1970	0
1971	13.286411950588912
1972	12.510755463775597
1973	5.650382577987051
1974	11.913453833140416
1975	13.955252180508154
1976	14.881758430491793
1977	14.204869374199117
1978	14.355510023295837
1979	16.22640503832932
1980	11.870417769294175
1981	16.563548235609822
1982	13.162971357388168
1983	8.552125203112974
1984	6.455277835158026
1985	6.1419928468763585
1986	6.232810638228579
1987	7.384750940698102
1988	9.810905413312659
1989	9.09255486026473
1990	9.346593461382808
1991	9.636555713045318
1992	11.054118502245945
1993	10.822378737099196
1994	10.451297598276641
1995	10.43460655349775
1996	11.104561739724465
1997	12.675947451736254
1998	12.858934873705435
1999	11.662797364619319
2000	10.6604824349551
2001	10.19789419029501
2002	9.421785345550084
2003	9.277987117761358
2004	11.107144049447337
2005	13.1702921720776
2006	14.562576588078544
2007	14.38363509862079
2008	15.709182640738273
2009	13.694593538440389
2010	14.639640628362876
2011	15.497476117269432
2012	18.312636324793168
2013	17.63025225927764
2014	16.566192241943547
2015	15.223512411128839