Year	% of GDP
1975	12.896886990899942
1976	14.084203636819455
1977	14.719777463328539
1978	14.331960523507584
1979	15.19274569353397
1980	14.617352506903096
1981	16.688811226798425
1982	16.914751050674898
1983	16.579794881965395
1984	16.201924593216308
1985	17.15283470805113
1986	16.822731535188925
1987	17.928300870870782
1988	18.54132906496764
1989	20.065984244859234
1990	21.016304676945396
1991	21.743720989183004
1992	22.94832058791652
1993	23.073030189397386
1994	24.888266146755456
1995	25.443124889216804
1996	25.452730333497055
1997	25.99016769402796
1998	24.925021610930305
1999	24.746672387352014
2000	25.142401089598405
2001	25.37009870416329
2002	27.17451308406674
2003	29.004635117167226
2004	31.331757375495247
2005	32.128505824031514
2006	33.83935695766961
2007	34.32966277254713
2008	33.39055261841714
2009	33.40684013772969
2010	34.37580954501736
2011	33.341433873345224
2012	33.55259869593041
2013	32.7770287375639
2014	31.955745031123254
2015	31.15143847205583
2016	30.58400908297087
2017	30.43585613820608
2018	30.058492139160407
2019	28.623737493767482
2020	27.8266896468658
2021	28.885249930711726
2022	28.239199152631127
2023	29.15460962081012