Year	% of GDP
1977	28.63564507649868
1978	25.221531575473644
1979	27.067320280396274
1980	26.004068119818992
1989	21.83599487661854
1990	26.230986482090298
2005	35.29872992929527
2006	36.161059098493574
2007	35.629188819237505
2008	37.85902786446049
2009	27.53235020157863
2010	30.52729608214893
2011	29.427566299212643
2012	28.12573486608667
2013	27.321493484243682
2014	24.493616895964593
2015	19.7525608698375
2016	19.531247232798908
2017	23.35822309954282
2018	26.591249528041157
2019	25.15426459104224
2020	19.971839514784566
2021	24.877419192077515