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	11.963343409569653
1983	12.079891218438716
1984	13.146200295804597
1985	14.385489279766121
1986	15.34055076040377
1987	15.767218920059673
1988	15.525263555449166
1989	15.97622228151922
1990	15.821342530811076
1991	15.713364152475092
1992	15.444239761394229
1993	15.429197561408811
1994	14.961687978499889
1995	14.681060999408157
1996	14.488929716689151
1997	15.408908462031391
1998	15.15545322079527
1999	15.458871635923764
2000	15.39985796917402
2001	15.20711423665469
2002	15.62678660963022
2003	15.120418026851903
2004	14.715113142699499
2005	14.800043128513712
2006	14.904773080762833
2007	14.984977134451603
2008	16.973190827023487
2009	16.687258365830964
2010	16.225430717478385
2011	14.551196794163646
2012	15.815676980456894
2013	16.171893715092512
2014	14.621784946023723
2015	14.899161410295978
2016	14.946649316534096
2017	15.195562845610436
2018	15.056063634945426