Year	% of GDP
1975	12.896886990899942
1976	14.084203636819455
1977	14.719777463328535
1978	14.331960523507584
1979	15.192745693533972
1980	14.617352506903096
1981	16.68881122679842
1982	16.914751050674894
1983	16.57979488196539
1984	16.201924593216308
1985	17.15283470805113
1986	16.822731535188925
1987	17.928300870870782
1988	18.54132906496764
1989	20.065984244859234
1990	21.016304676945396
1991	21.743720989183
1992	22.948320587916523
1993	23.073030189397382
1994	24.888266146755456
1995	25.44312488921681
1996	25.452730333497048
1997	25.990167694027964
1998	24.925021610930305
1999	24.746672387352007
2000	25.142401089598405
2001	25.370098704163293
2002	27.174513084066742
2003	29.004635117167222
2004	31.331757375495254
2005	32.12850582403152
2006	33.839356957669615
2007	34.32966277254713
2008	33.39055261841714
2009	33.40684013772969
2010	34.375809545017354
2011	33.341433873345224
2012	33.55259869593042
2013	32.777028737563896
2014	31.955745031123254
2015	31.15143847205583
2016	30.584009082970862
2017	30.43585613820608
2018	30.058492139160407
2019	28.623737493767482
2020	27.8266896468658
2021	28.885249930711726
2022	28.239199152631127
2023	29.154609620810124