Year	% of GDP
1997	23.68056583598166
2010	30.243014486623725
2011	30.835749963913525
2012	31.141108037878944
2013	30.94260266347448
2014	30.298157518444555
2015	29.474408510842515
2016	29.136640203645953
2017	28.901672836414818
2018	29.643352516835492
2019	29.687919288537355
2020	28.46254023657324
2021	28.59680736616279