Year	% of GDP
2000	19.266581652104843
2001	18.35358518672199
2002	18.45559670781893
2003	17.50060015003751
2004	18.67768826388889
2005	18.815064546640574
2006	18.915901237385683
2007	19.49862802977336
2008	20.125776184389295
2009	20.37090500911016
2010	19.39428798432956
2011	19.28219449298635
2012	18.779819496843686
2013	19.30592015794405
2014	19.085720356568135
2015	19.709545693896075
2016	20.130543282848404
2017	19.407853282826412