Year	% of GDP
1975	12.578724889848102
1976	12.908226031421002
1977	13.439827356060121
1978	13.660727501322087
1979	13.932125666453558
1981	14.129475464000055
1983	13.846606398344115
1984	13.158138687710638
1985	13.547917811540794
1986	12.97070953336162
1987	12.868324189409911
1988	12.390179545446665
1989	12.670146814012266
1990	12.221261977485886
1991	11.972473613664258
1992	12.375308224273631
1993	11.416819409742441
1994	11.902283880581674
1995	11.788630556950993
1996	12.05867444531681
1997	12.833460659169123
1998	11.582482087610316
1999	11.49027544702862
2008	13.052563125850384
2009	12.214334159356838
2010	11.914338032573031
2011	11.940932007123324
2012	12.04386342033018
2013	12.25382608594364
2014	12.01806935835447
2015	12.502945207513529
2016	12.599622207030372
2017	12.436713197554198
2018	12.978089492033423