Year	% of GDP
1971	15.7676348547718
1972	20.59902200489
1973	23.9541832669323
1974	20.609756097561
1975	19.0211732037487
1976	22.8394808462917
1977	23.7226277372263
1978	23.0497646267653
1979	19.2827894279687
1980	15.9755822179708
1981	15.0762967860712
1982	14.0078475309385
1983	13.1387512723312
1984	10.7617940763922
1985	8.36987271137932
1986	6.90347160756467
1987	6.2281397330065
1988	6.19402690949833
1989	7.20334243563508
1990	6.82772351272976
1991	7.4331821713939
1992	7.05371759267409
1993	7.06552134285017
1994	8.701697885839
1995	10.6838407626934
1996	11.8267804405985
1997	12.8730266185998
1998	13.5017535791543
1999	14.2154305048891
2000	15.557737739135
2001	16.9880797719772
2002	19.1097150865934
2003	24.5813262053288
2004	23.7886945246316
2005	23.3799538731127
2006	21.3959512451102
2007	23.7891064426077
2008	27.5236066293085
2009	19.9920673192168
2010	24.1552557359059
2011	22.3906178455982
2012	20.8600885056372
2013	21.3672112428035
2014	24.3504437974192
2015	24.3497337704834
2016	24.5166106524244