Year	% of GDP
1985	8.32307006807245
1986	14.59758471419295
1987	12.038825775800667
1988	-2.681822971739098
1989	10.709442392934342
1993	6.433987745033122
1994	11.52201103460895
1995	-4.936082009953953
1996	16.803622455007737
1997	-10.084325354481807
1998	21.65532340901413
2000	12.942577358317234
2005	-4.673271572501993
2006	5.97062652779521
2007	5.491858055652559
2008	-1.2092747608759165
2009	-7.8230670472129535
2010	14.632934330945737
2011	-2.300226762484171
2012	4.829026577626777
2013	-1.9547779886515892
2014	4.555388907372437
2015	1.8188082029097423
2016	2.5961358085922615
2017	-0.7581876167609828
2018	0.4025078793843144