Year	% of GDP
1960	8.39707628768749
1961	12.1235248055267
1962	14.6418317132046
1963	11.8612863607521
1964	13.1251479869409
1968	19.0343160947318
1969	21.6896294917148
1970	21.4028500725318
1971	18.3394320843091
1972	18.407447973713
1973	11.8106995884774
1974	0.260813314122732
1975	5.13977304179352
1976	1.45889757772268
2004	7.09938997689894
2005	-0.959502569366978
2006	-3.6649596775346
2007	-11.2299525867531
2008	-16.3781780794533
2009	-9.61517856385888
2010	-1.24640077475789
2011	-0.518036159165297
2012	-1.86413647829281
2013	-1.38295756396864
2014	0.34105240432053
2015	8.8442729635195
2016	18.7584734058859
2017	17.9198745941
2018	6.96635568654102