Year	% of GDP
1997	11.32796640092432
1999	10.578106597357085
2002	10.349436705637629
2003	10.597868546747973
2004	11.07437658895248
2005	11.469100877736645
2006	12.588360567525106
2007	13.139336517010054
2008	12.646119508277415
2009	11.481366908777764
2010	11.659866816419939
2011	11.629439544682485
2012	11.840767751342755
2013	11.791061978208399
2014	11.273612488371118
2015	11.545908389741257
2016	11.659113923588516
2017	11.83314480666045
2018	12.32021306892187