Year	% of GDP
1990	16.930006442958177
1991	16.10620454302864
1992	16.906904229674723
1993	16.825924387958647
1994	16.46564771676311
1995	16.372729342647997
1996	16.95716651872393
1997	17.686992993032447
1998	16.64149417588557
2009	21.39374545681865
2010	21.027062541665323
2011	20.26659235070123
2012	20.841703613254808
2013	21.17945552141702
2014	21.297095948355267
2015	21.426151456959044
2016	20.94048296199258
2017	20.89852260071119
2018	21.18559069781506