Year	% of GDP
1970	1.824399609266423
1971	1.8122032902448515
1972	2.4417276438903093
1973	4.322653216280344
1974	7.857489440066176
1975	9.009928281108834
1976	10.606821712863372
1977	11.167447457296545
1978	11.53076686742656
1979	19.194810833473163
1980	19.662685136098872
1981	16.441220932760285
1982	13.468359088788898
1983	12.16378508246413
1984	10.352305361434102
1985	9.726468661029593
1986	6.418866326095899
1987	7.634418867403337
1988	7.094103456161913
1989	8.229215138574006
1990	9.270264863064902
1991	6.525091341388258
1992	6.1243383679685355
1993	5.198123655027347
1994	4.218911502314069
1995	4.188646962910445
1996	3.959156603249893
1997	3.3603005841925047
1998	2.6857700946159744
1999	2.803057235706994
2000	4.0927125893353145
2001	3.6127552804969167
2002	2.960153730875117
2003	3.215777170900054
2004	5.408468812307419
2005	5.929686106439791
2006	6.183147025191968
2007	6.760824209966481
2008	9.50518364612621
2009	4.296688287620542
2010	6.311221232307051
2011	7.636772206823154
2012	4.409736654079374
2013	3.371329181095919
2014	2.7807733375408397
2015	1.5408115626856274
2016	1.3584996494372223
2017	1.654596431640934
2018	1.8325023003603487
2019	1.5786189059846245
2020	1.1044788225427875
2021	2.107471523924713