Year	% of GDP
1962	6.61935250666413
1963	8.65845648491703
1964	9.27332215723855
1965	8.73315145699
1966	9.46754024914485
1967	10.9542879423552
1968	12.0371108978379
1969	13.5448504310957
1970	13.1992993431307
1971	13.9019287678502
1972	15.4647821926474
1973	14.1862503826402
1974	15.5079148582477
1975	16.3951467655497
1976	17.6081070302686
1977	19.1997408091933
1978	22.6643626313093
1979	29.6619328568006
1980	38.492385149109
1981	41.3149595506523
1982	38.0476492206314
1983	37.119081649594
1984	38.9749516335309
1985	38.9483345021925
1986	36.9716789590216
1987	32.1437601385084
1988	25.5830837292638
1989	22.667112547143
1990	22.1506627886752
1991	23.9483527020969
1992	28.299112365718
1993	29.0744829400725
1994	25.7606780296208
1995	17.3467725344339
1996	14.2229718919525
1997	13.2495473671532
1998	15.4992133387917
1999	15.0427292302205
2000	15.1574863610288
2001	16.1680228716339
2002	18.3258870869396
2003	17.9109305773997
2004	15.0122057055064
2005	12.836104440944
2006	11.0503386521185
2007	11.6194290580064
2008	10.871349213361
2009	12.8952000936545
2010	12.5710184094953
2011	14.3754981569091
2012	15.5394514573689
2013	18.3090728280993
2014	19.1993340826506
2015	20.4817430643295
2016	20.6292567691
2017	20.9175145810837
2018	21.0300982223965