Year	% of GDP
1997	18.05649165394788
1998	17.71118080196075
1999	17.44711347335132
2000	17.358165201606056
2001	16.316668010787968
2002	15.838255849358632
2003	15.640023910296645
2004	15.533091158203455
2005	15.283942906496545
2006	15.151316077740926
2007	15.013849438672999
2008	14.544995858021043
2009	13.583589925385722
2010	14.16648246999338
2011	14.124321918484261
2012	13.994883721579585
2013	13.735729237495754
2014	13.715222712252723
2015	13.921713224243543
2016	13.820132138231095
2017	13.806650655843836
2018	13.815118642562824
2019	13.47516617714308
2020	13.193770215922848
2021	13.311642033071495