Year	% of GDP
1972	21.54519300360445
1973	22.573261213293964
1974	22.420506000304176
1975	22.430937024562645
1976	22.914198714563703
1977	23.369767892511614
1978	23.4392274533934
1979	23.182163118934103
1980	24.497656984074734
1981	24.839195039188716
1982	25.352372072831443
1983	24.93068359713952
1984	25.392342969098564
1985	25.554589240351028
1986	25.19087735469859
1987	25.224657302927316
1988	24.57125692681875
1989	24.90520146766514
1990	24.409356028332134
1991	28.576113002900744
1992	29.5350340176022
1993	29.4849476551925
1994	30.1481785138422
1995	30.04898105678741
1996	29.84188447886415
1997	29.83887005073554
1998	29.593878138620543
1999	30.11983607512576
2000	29.907922374104473
2001	28.995783737008296
2002	28.852428438847745
2003	29.44455748631063
2004	28.179463606951536
2005	28.104496331353708
2006	27.863761383265974
2007	27.570442679682344
2008	27.803290018810205
2009	28.78833722446877
2010	27.990953049446265
2011	28.32322279808135
2012	28.554990146832232
2013	28.548455368417308
2014	28.50117680012844
2015	28.506004269408958
2016	28.405194689192726
2017	28.556360876112585
2018	28.938566907842933
2019	29.168420113352774
2020	28.959406298384422
2021	29.087312886149082
2022	28.85978420402341