Year	% of GDP
1997	65.35386483445707
1998	65.9776449945049
1999	66.37597895718028
2000	66.59693690154218
2001	67.65756499531876
2002	68.2548291010284
2003	68.12884312099561
2004	67.78757086556418
2005	67.76661857250383
2006	67.4357386011003
2007	67.39204490129246
2008	67.88130301588974
2009	69.96596888963393
2010	69.21585508018191
2011	68.8555708932791
2012	69.23007667347912
2013	69.09698775177381
2014	69.07942039698314
2015	69.72351655582038
2016	70.11551200767735
2017	69.69060959060461
2018	69.61211886413973
2019	70.11492695915115
2020	70.62511181319215
2021	69.76413513628736