Year	% of GDP
1979	3.9024395002974996
1980	3.951185355244079
1981	3.6675682978084656
1982	3.8562091503267975
1983	3.1804543506215173
1984	3.2573062704889444
1985	3.941062871039268
1986	3.9793281653746773
1987	4.778067885117494
1988	5.001209482341558
1989	5.069382273948076
1990	4.866204663867672
1991	4.749833222148099
1992	4.352777426293812
1993	4.102395799146702
1994	4.359652992207028
1995	4.346581762243766
1996	4.410958904109589
1997	4.075175599569702
1998	4.406972224713726
1999	4.4662214898968
2000	4.5137683288373704
2001	4.495731056563501
2002	4.204853226821328
2003	4.104098893949252
2004	4.0340171065853
2005	3.7985538147770463
2006	3.6123511139454036
2007	3.109758402964195
2008	2.5575063060655165
2009	2.9435477496561644
2010	4.987999261493014
2011	4.3335026485741235
2012	3.758769017581339
2013	3.4146069296434747
2014	3.4960650927037484
2015	2.8346535772122974
2016	2.5086474553460754
2017	2.903392384786435
2018	2.7765649188266583