Year	% of GDP
1997	65.84010075319244
1998	66.59254556044868
1999	66.9841619771961
2000	67.21506630785792
2001	68.29106026001467
2002	68.93660369061637
2003	68.75101607998798
2004	68.45809660319772
2005	68.49820606461822
2006	68.23263692188159
2007	68.19804127021908
2008	68.66549371356774
2009	70.74765549035513
2010	70.1342036314968
2011	69.85894793466414
2012	70.24123819280015
2013	70.10809351300192
2014	70.10939420838902
2015	70.82107252595648
2016	71.17750905002461
2017	70.73604315213775
2018	70.5997536786683
2019	71.08973691074814
2020	71.61070557554972
2021	70.7857991626557