Year	% of GDP
1997	14.864444551262206
1999	14.365372999784062
2002	14.17946894537408
2003	14.483163930524945
2004	14.625632910907196
2005	14.803301819395351
2006	16.536282469828716
2007	17.153426612323607
2008	16.278783907023257
2009	14.37934370836478
2010	15.702279207498682
2011	15.249768373527937
2012	15.652447540539635
2013	15.35375899637233
2014	14.640526800157822
2015	14.602317869216206
2016	13.992402277106828
2017	13.999145152589419
2018	14.56130940768088