Year	% of GDP
1997	18.742421773263942
1998	16.647209151984104
1999	14.182305860037731
2000	13.72158311683796
2001	13.568216085352788
2002	12.691097976305924
2003	13.887221837463008
2004	14.07074277670274
2010	16.46783198549262
2011	15.207075919110084
2012	15.79604354780335
2013	14.608981538555804
2014	15.30891499446697
2015	15.487142712708996
2016	16.33094030410211
2017	19.026139208636522
2018	14.705043307879222
2019	16.064212550936503
2020	16.83286426875138
2021	17.11651935024555