Year	% of GDP
1974	8.732911915348323
1975	10.112372114348137
1976	10.62936618619248
1977	10.505316503091716
1978	11.269943897088558
1979	12.314447745981392
1980	11.7024781243222
1981	11.376033867530406
1982	11.95987281861206
1983	12.0777926988042
1984	13.142959684917999
1985	14.378945124947723
1986	15.338638236133374
1987	15.767218920059673
1988	15.519502503319298
1989	15.971533642043118
1990	15.484217078555437
1991	15.338979529172589
1992	15.116475956062104
1993	15.145108126071822
1994	14.603286530228035
1995	14.245725610318196
1996	14.080710542639299
1997	14.597482299813047
1998	14.40763022869797
1999	14.804038060781052
2000	15.41040259526842
2001	15.545625520477694
2002	16.05294821267944
2003	15.577593722297788
2004	15.133482999865702
2005	15.173983590343784
2006	15.18947956367647
2007	15.257860023557088
2008	17.22767043295221
2009	16.851892711600097
2010	16.505135951404878
2011	14.489839403044643
2012	16.166712404357227
2013	16.638682548697588
2014	14.803137644202549
2015	15.125690362283345
2016	15.271950025228204
2017	15.614109922097466
2018	15.663131915142317