Year	% of GDP
1960	21.8019243930182
1961	22.3767038385452
1962	21.7844204773487
1963	22.5379913970305
1964	22.4782108307273
1965	26.1905525147201
1966	27.3937899031096
1967	28.1632615828984
1968	28.5666798533262
1969	29.1874640530375
1970	30.3718208732086
1971	31.799495510039
1972	31.8000387019719
1973	31.3248281642725
1974	26.3188589620267
1975	27.3491502761824
1976	27.4477073239843
1977	28.2232682972952
1978	31.2872401035693
1979	32.9369084934228
1980	32.064878164979
1981	32.446790336451
1982	37.9607874094138
1983	39.6034282975162
1984	39.7947451190995
1985	40.2381809472467
1986	49.1992101480779
1987	49.2664547639445
1988	47.5182938813953
1989	46.434448828768
1990	43.8135072785409
1991	38.3917226789834
1992	40.1710705966468
1993	39.7871584993759
1994	41.7695727514617
1995	41.8202853131018
1996	40.9928158072731
1997	43.7772997567775
1998	43.0793345699856
1999	44.8339916606721
2000	43.2472785742716
2001	45.8457834567622
2002	47.5610335354002
2003	46.6608067644457
2004	44.8820090243044
2005	43.2714308640227
2006	42.612380527577
2007	43.4743557264903
2008	41.5426437635303
2009	46.4755267381111
2010	47.1344848982595
2011	47.3598853038162
2012	47.834422594847
2013	49.794947496805
2014	51.9334073528658
2015	56.8141297012448
2016	60.6177813574271
2017	58.7256360449302