Year	% of GDP
1970	2.143348856090279
1971	1.9338307235953844
1972	2.2813003636909124
1973	3.260159611815083
1974	2.729062116563179
1975	2.7997251796117197
1976	2.902487924697924
1977	4.567159959430035
1978	4.055487188521558
1979	3.515923316838919
1980	3.7225848809032813
1981	3.68235687145898
1982	5.26734447675961
1983	3.586419427464181
1984	3.0629208838711564
1985	2.345331842424938
1986	3.4899589388699446
1987	3.2169588942829668
1988	3.4433711970992564
1989	3.4694672815213985
1990	3.528574278693377
1991	3.3216439697651494
1992	4.637628685192456
1993	3.916660176395262
1994	4.810488939752783
1995	6.788679744478272
1996	6.242160932930915
1997	5.488661182393312
1998	5.44890766426151
1999	3.5887089463377615
2000	3.3117484263979136
2001	3.286380454092723
2002	3.674198104393354
2003	5.174430883540033
2004	4.03584818328214
2005	3.6661969532443908
2006	3.313115607743803
2007	4.054794038596448
2008	4.041787010730904
2009	3.9485720402838678
2010	3.3001940736899895
2011	3.451121245314244
2012	3.8125678269164798
2013	3.731695843903465
2014	3.957718644780059
2015	4.018572462012031
2016	4.022184018069144
2017	3.71191627098945
2018	2.4833099601799877
2019	2.3019768573996897
2020	2.5061343965905585
2021	2.4460318802192664