Year	% of GDP
1981	1.77640572451412
1982	2.10643461567012
1983	2.07711661430999
1984	2.09133572210669
1985	1.93983916331288
1986	1.92923551182325
1987	1.63270879819631
1988	1.55269831041114
1989	1.31522234080431
1990	1.22014067179869
1991	1.22098183590653
1992	2.04762860212462
1993	2.14845248276628
1994	1.76902101931724
1995	1.16619604666338
1996	0.911234589026348
1997	0.912570547264553
1998	1.37566840272673
1999	1.3833783144103
2000	2.12344219763044
2001	1.99062147444592
2002	1.34048798411306
2003	0.951746573175938
2004	4.78763735240833
2005	4.5445469697572
2006	5.12584168187662
2007	9.44834003607713
2008	9.42895736341358
2009	8.64994794355443
2010	8.84810020762782
2011	8.57215225478966
2012	8.22817784298207
2013	7.15521853043965
2014	6.4644861205696
2015	6.6881203826434
2016	5.38428178643838
2017	4.62448239316692