Year	% of GDP
1972	13.169365701703967
1973	11.134247185438202
1974	10.652489125181248
1975	11.899466192170818
1976	12.555638447909438
2003	20.902576569587264
2004	19.541290652136897
2005	19.881587440148813
2006	19.908210850849297
2007	22.42385531872626
2008	22.047000783867198
2009	23.607619138837915
2010	22.74800692314375
2011	22.504152374220883
2012	23.49926828670937
2013	23.8938403917359
2014	24.241917734948572
2015	21.97608747178355
2020	24.39244928844032