Year	% of GDP
2000	14.631493248610008
2001	16.63780082987552
2002	16.68687242798354
2003	17.50138784696174
2004	17.02734434027778
2005	15.660915329419439
2006	14.156266365710371
2007	13.371909130680434
2008	16.16208011903529
2009	17.489789634777757
2010	18.068377989426452
2011	17.5988064516129
2012	19.138348914061122
2013	18.916344621425065
2014	18.70842637841958
2015	18.19273331516628
2016	18.171204760290742
2017	17.6109533799361