Year	% of GDP
1995	13.60078830199656
1996	8.86171869158599
1997	9.904836957177867
1998	14.568944102606743
2002	16.484242269375294
2003	17.196137740542806
2004	17.965075861919377
2011	18.022013279779554
2012	17.483233556745855
2013	16.503270612338923
2014	18.301936135826935
2015	18.515789855309915
2016	17.590229809729035
2017	18.887486060684765
2018	18.54596747316205
2019	18.144377190386614
2020	16.983262295898932
2021	18.198589441130782