Year	% of GDP
1968	-1.16582649773139
1969	2.94411977442147
1970	1.62575419456153
1971	-5.46235691906815
1972	-15.9104753345317
1973	-17.076925853729
1974	-25.0746203850734
1975	-50.2463380538504
1976	-50.9409577764008
1977	-46.8978781818669
1978	-35.7441061893715
1979	-21.8253009804808
1980	-26.5631434046852
1981	-44.5194083100325
1982	-53.4129715571427
1983	-55.2349827913813
1984	-47.2484687753524
1985	-45.8472355826721
1986	-18.3723060679461
1987	1.21910940357896
1988	10.17977786451
1989	15.8916443784745
1990	12.7804898656325
1991	15.1254056636034
1992	20.7752101932471
1993	25.2060166338973
1994	30.5437084531533
1995	30.4129317141933
1996	26.9266759807508
1997	30.4470946697811
1998	40.8573552473866
1999	40.8628507486166
2000	34.5411245302014
2001	39.1181364504366
2002	40.7154063028639
2003	43.0636207155111
2004	40.351419843489
2005	28.8240602029135
2006	21.3040348114157
2007	16.1031133666533
2008	-3.65280827687537
2009	0.523786648205196
2010	-0.12472888164594
2011	-4.10205360915813
2012	-10.1518294917389
2013	-7.86155272616559
2014	1.76515842343929
2015	20.5006868616818
2016	34.0594537570051
2017	38.7823180138103