Year	% of GDP
1997	17.844839535922013
1998	17.578500394487865
1999	17.394352530162298
2000	17.277068400293846
2001	16.237087156900817
2002	15.802456129512437
2003	15.61516528958617
2004	15.521270106157056
2005	15.256802256405827
2006	15.058689609615202
2007	14.917746075693481
2008	14.414191703649248
2009	13.525915906615957
2010	14.09413960861508
2011	13.928632488368354
2012	13.740978784325323
2013	13.47423770231779
2014	13.511683533964893
2015	13.791041345224231
2016	13.705900326608097
2017	13.695247790867413
2018	13.68805044513599
2019	13.353282981597815
2020	13.173573966027947
2021	13.234767427091871