Year	% of GDP
1970	2.002494491687429
1971	1.8196705458234046
1972	1.8386694548945015
1973	2.301179856755649
1974	1.9937687596410223
1975	2.3247137942577467
1976	2.0511306559329925
1977	2.9516373894891474
1978	2.9195583374074405
1979	2.587584836876785
1980	2.4222016360624465
1981	1.7310503348611388
1982	2.489266744255436
1983	1.9964301286671777
1984	2.1111462970537387
1985	1.9481242902283775
1986	2.838958388937567
1987	2.559239575983545
1988	2.6959715856604807
1989	2.8300679381703038
1990	3.0361121893956007
1991	2.842155550113663
1992	3.465201558382892
1993	3.4261452662266754
1994	4.086767435704256
1995	5.004791293735837
1996	4.641129243852187
1997	4.151168629054962
1998	4.334413787323017
1999	3.032694368027053
2000	2.9285490095165865
2001	2.9603674912091775
2002	3.2826503837322676
2003	3.977964357605226
2004	2.7380653639002017
2005	2.5120139079912716
2006	2.211159656398737
2007	2.647928347716551
2008	2.845749147422771
2009	2.936070540023174
2010	2.2476481598256735
2011	2.32149959073452
2012	2.5785751087933044
2013	2.5758645705038283
2014	2.711047395560629
2015	3.1526603894911847
2016	3.6168617782399886
2017	3.389992952119256
2018	2.339707592654475
2019	2.1747269109587055
2020	2.50184977335776
2021	2.3731435262401286