Year	% of GDP
1962	2.39787017429152
1963	3.43876082372756
1964	3.9984102957227
1965	4.06212313948066
1966	3.67738939755127
1967	3.05719696270097
1968	2.75464322200933
1969	2.77226438258804
1970	1.41589424906525
1971	1.2436478250104
1972	1.48537200302437
1973	1.91822153254841
1974	3.37829386348019
1975	8.31131461259068
1976	10.9798121490891
1977	13.9569455952295
1978	15.9405793345071
1979	15.1172365353064
1980	14.1637129689364
1981	14.3706727418228
1982	13.5668417514525
1983	12.032728300719
1984	11.3562479074047
1985	11.1549230514789
1986	11.117072123761
1987	10.1737091926532
1988	10.4277814403926
1989	12.188615494152
1990	12.2234670759123
1991	10.5211560562332
1992	8.82005307418417
1993	8.1751434329864
1994	7.31358760535758
1995	5.5814664931852
1996	6.53819989112421
1997	13.1084022572292
1998	12.2986023922074
1999	11.5375458020389
2000	14.3264529827893
2001	14.7424870232313
2002	11.2892153428887
2003	14.9889910366952
2004	14.4409525060969
2005	16.5469904000695
2006	16.6156088118694
2007	11.8461311837314
2008	16.5593779174753
2009	16.5630620404634
2010	18.3714623560978
2011	18.6132941448879
2012	20.4502175175875
2013	25.9951206053467
2014	30.7092284554233
2015	33.1409599930718
2016	31.9689545874685
2017	34.0710053124334
2018	34.0327069472514