Year	% of GDP
1980	16.4323118119607
1981	26.7524934383202
1982	33.6087451504519
1983	29.9731884443147
1984	27.7561719660303
1985	29.7845892557202
1986	32.378733126755
1987	36.6331499948296
1988	39.8820006698897
1989	39.844118949119
1990	30.5720000352536
1991	23.2581277397157
1992	10.7118711174778
1993	1.47813564172512
1994	-3.64163226729127
1995	-7.73094713040864
1996	-12.3601894431989
1997	-16.4265531705605
1998	-18.4222942507645
1999	-0.991180237078084
2000	3.144230447461
2001	4.2935644177615
2002	9.1369314032568
2003	3.88720901880548
2004	-1.50409481809964
2005	-0.939321419677386
2006	-4.73212619309458
2007	-17.1278822195377
2008	-16.9726962577387
2009	-14.2171831616428
2010	-5.78849784823691
2011	0.629558196818778
2012	2.909532072608
2013	1.59900195536324
2014	0.603614391765601
2015	2.31956506345324
2016	9.24700731914231
2017	15.8693784570141
2018	17.3174241271112