Year	% of GDP
2000	17.05133145353455
2001	16.489850746887967
2002	16.664444444444445
2003	16.16695423855964
2004	17.2120653125
2005	17.639530528375733
2006	17.632685229544684
2007	18.269118946905227
2008	18.684902729970112
2009	19.13386957058658
2010	18.21437083379139
2011	18.04880009918292
2012	17.154388272972497
2013	18.164701757908357
2014	18.114326670619125
2015	18.714797065132984
2016	19.14482851575895
2017	18.225116568692133