Year	% of GDP
1997	17.914069640461435
1998	17.52481783505756
1999	17.296543969846166
2000	17.206421522616687
2001	16.131194167810733
2002	15.659569764503756
2003	15.48254253050282
2004	15.39122874725063
2005	15.149313514696885
2006	14.984484580792321
2007	14.854465371179481
2008	14.359467423936948
2009	13.378498938989846
2010	13.985247742752026
2011	13.909732418932553
2012	13.753507526358833
2013	13.477065973420096
2014	13.42626483646831
2015	13.48806032432925
2016	13.410246325905797
2017	13.400781949824719
2018	13.389109922545114
2019	13.040398529997093
2020	12.721846659110913
2021	12.75638475235715