Year	% of GDP
1979	21.95122218917344
1980	17.68728975350411
1981	18.528970279195438
1982	17.118735475671752
1983	23.54907843977711
1984	25.095905698542232
1985	26.099706744868033
1986	22.465854558877815
1987	19.10574412532637
1988	18.78326076439284
1989	19.029767233661595
1990	19.581162426020537
1991	15.534800978430063
1992	15.196760723775782
1993	16.955201837873318
1994	15.277165122776063
1995	15.425893464028906
1996	16.51027397260274
1997	15.709042586850597
1998	26.098005800221248
1999	24.84606712340647
2000	22.96413023156433
2001	23.529882604055498
2002	24.266134106639676
2003	22.828887443070915
2004	23.59875499350538
2005	22.2744970798183
2006	20.98496225134229
2007	20.959204506786648
2008	20.014032039824265
2009	19.39073936481338
2010	19.542741091759495
2011	20.85915390755388
2012	21.618695689829384
2013	21.52122970484852
2014	23.396025076697345
2015	22.42113059743651
2016	21.682977794042994
2017	21.370232587549665
2018	21.21918786964633