Year	% of GDP
1972	9.55539772727272
1973	13.1835891381346
1974	18.7665787159191
1975	16.7909440473549
1976	21.3394775528667
1977	16.8886758672712
1978	23.8519784625485
1979	12.3060876308647
1980	6.58903247664682
1981	5.57691518458441
1982	7.50616971310762
1983	8.09978495929724
1984	7.19757786602777
1985	13.6496140990658
1986	22.4064759478687
1987	19.2047352735145
1988	22.2058613738564
1989	19.0878288378288
1990	14.9989984197289
1991	14.1682718767199
1992	18.2617640301594
1993	22.7400283120993
1994	25.395627403217
1995	25.6313052326129
1996	26.3889314471511
1997	33.2566713194844
1998	47.4756943816142
1999	42.514144402697
2000	37.6231501479882
2001	43.2002593825625
2002	40.660524990639
2003	38.2607655502392
2004	34.2613111241808
2005	27.7617688896327
2006	27.5411300185192
2007	32.5844049240505
2008	28.9328638958754
2009	39.9669148898432
2010	37.1703601827213
2011	34.1254274060179
2012	36.0167064435175
2013	36.5555780949803
2014	41.5508018380702
2015	65.4437249653778
2016	70.4775012837958
2017	70.9531011559207
2018	66.8118583594784