Year	% of GDP
1964	3.65625
1965	3.8887311950042602
1966	4.16343418670804
1967	4.84293193717278
1968	4.84437163585303
1969	4.64403066812705
1970	4.33621043978627
1971	4.00074087794036
1972	5.090337784760409
1973	3.81528931437421
1976	12.1249085142718
1977	4.73228442492987
1978	8.48960109103307
1979	10.0717488789238
1980	12.3571428571429
1981	9.58333333333333
1982	9.28645130565918
1983	13.4556205877029
1984	10.968726704767299
1985	6.28697601510223
1986	5.2638395500296
1987	1.1218465783679399
1988	1.18657817109145
1990	7.55195134313229
1991	5.15488867376573
1992	7.98399831561217
1993	6.011278768480411
1994	6.99771316563215
1995	6.71192798911137
1996	5.661852426853129
1997	4.30515463917526
1998	4.02325225638672
1999	4.77043929225137
2000	5.39210030383447
2001	5.44789624491027
2002	4.75330090340514
2003	4.67569110879715
2004	4.514245068861491
2005	4.47893172691688
2006	4.57603784913407
2007	4.63239840402185
2008	4.00131449104104
2009	4.020042001407511
2010	4.12655312377024
2011	4.05865660564424
2012	3.98937634457757
2013	4.16539813900342
2014	4.67817522836761
2015	4.48688434454642
2016	5.06266311306368
2017	4.50513980065137
2018	4.8517945792174295
2019	4.24221838501955
2020	3.0326454174822
2021	3.3662224640045704