Year	% of GDP
1997	0.526939988136292
2001	0.642239987850189
2003	0.676500022411346
2004	0.726809978485107
2005	0.770240008831024
2006	0.802909970283508
2007	0.79364001750946
2008	0.805670022964478
2009	0.749930024147034
2010	0.662840008735657
2011	0.667530000209808
2012	0.669340014457703
2013	0.663299977779388
2014	0.709869980812073
2015	0.731469988822937
2016	0.749920010566711
2017	0.762570023536682
2018	0.687730014324188
2019	0.614300012588501
2020	0.603600025177002