Year	% of GDP
1960	11.0766536645934
1961	11.7831081729173
1962	12.5932610799413
1963	13.1102666342019
1964	12.6044788324686
1965	12.3754217246734
1966	12.0880252696446
1967	13.5353358029628
1968	14.3830672600503
1969	14.4549900923995
1970	18.4526570048309
1971	18.3925027563396
1972	20.4043548387097
1973	22.5467437874893
1974	25.4901662539795
1975	29.1476372174934
1976	28.561843003413
1977	33.2311721224921
1978	37.5710531718333
1979	36.5656116972053
1980	38.2438647203353
1981	41.7513992158983
1982	43.2115316781983
1983	46.0784429662478
1984	42.3143486400176
1985	36.0715636508411
1986	32.4798705780846
1987	38.3911391168425
1988	32.3617095933979
1989	35.8426248421285
1990	31.6152577190934
1991	28.1899651490845
1992	28.8070158484731
1993	29.5186080649339
1994	27.0214962921243
1995	25.262984889427
1996	24.949508650074
1997	28.2740780654001
1998	25.9364255440735
1999	28.1929708031305
2000	34.2645656096932
2001	34.21008168028
2002	40.2248585527715
2003	40.0141618931512
2004	34.7448166184333
2005	34.2858450348486
2006	29.031150449118
2007	26.036072661849
2008	24.2755976786496
2009	23.9950450718689
2010	21.2645627076629
2011	18.1168545303516
2012	21.0231393386343
2013	26.2160911298202
2014	28.9453016095193
2015	32.1807047904649
2016	31.5583698778831
2017	32.8496491062943
2018	33.9982590213206