Year	% of GDP
1997	19.02155363395935
1998	18.637503653602238
1999	18.4473946060807
2000	18.284118982454544
2001	17.2070756677606
2002	16.76791597488617
2003	16.601938169123624
2004	16.465555326108106
2005	16.261118000822712
2006	16.22561423745823
2007	16.19296985738979
2008	15.938191404806238
2009	15.381315839665053
2010	15.891650404169793
2011	15.957575203029537
2012	15.939556827803129
2013	15.78839427346104
2014	15.921796132013222
2015	16.390221009650972
2016	16.20661751909703
2017	16.264125055313492
2018	16.37387759769824
2019	15.967692701749675
2020	15.952538062870925
2021	16.48446671103642
2022	15.833731108199602
2023	15.347875410584766