Year	% of GDP
1971	18.9211618257261
1972	22.5550122249389
1973	25.8964143426295
1974	22.8861788617886
1975	20.9649427282194
1976	23.6327083247856
1977	22.7696674776967
1978	23.7222595830531
1979	21.0820201017496
1980	20.2569274869944
1981	24.2690656307504
1982	28.1985142385473
1983	31.1008157921241
1984	31.8790375433012
1985	33.820234044319
1986	35.7752073840402
1987	35.1959939752023
1988	40.3989211858474
1989	43.5386403253922
1990	42.305932591124
1991	46.3713953840715
1992	46.5919322888529
1993	53.0583156865939
1994	63.6618687484752
1995	72.1383413908516
1996	78.9043465658747
1997	79.6497062171332
1998	92.3293040930247
1999	103.362901680437
2000	110.05713972106
2001	117.314405506324
2002	129.163657822834
2003	135.709796315693
2004	110.49220413384
2005	102.692693674797
2006	85.5315772182628
2007	76.2570667585908
2008	66.0037367429758
2009	43.055129969739
2010	49.612544831525
2011	43.9207851760132
2012	36.546803958227
2013	37.6157462998974
2014	35.1556374416918
2015	35.6212041696653
2016	40.1966819535615
2017	43.9534736780834
2018	41.1391929560385