Year	% of GDP
1976	4.194136158089205
1977	7.729976888414949
1978	5.734711719617516
1979	10.555512253033692
1980	12.20474673396514
1981	14.945732354303884
1982	12.797125142671185
1983	10.172047080671257
1984	10.23244763916185
1985	10.045110131463549
1986	7.783953895608331
1987	7.4162014580916145
1988	5.28273298338648
1989	5.008039508546461
1990	7.839367166473352
1991	5.3323625032951645
1992	6.418791801992341
1993	11.911934695349508
1994	9.016316222734925
1995	11.433126006051337
1996	11.916098021847773
1997	20.435747807905415
1998	15.34094392068701
1999	11.847340505993156
2000	13.90563877278948
2001	12.219243961285533
2002	10.959689632532449
2003	6.650209298948527
2004	6.6788235372083005
2005	6.489254373222845
2006	6.004253896138923
2007	4.895113006947245
2008	3.056707874767519
2009	2.618595829506182
2010	2.3379906111902713
2011	3.0822970341938736
2012	4.489068898480298
2013	8.185000937211882
2014	8.10417086081206
2015	10.301853541450525
2016	9.941707034399743
2017	10.142430411862643
2018	11.949226880679529
2019	13.784704810306344