Year	% of GDP
1997	65.30321875518418
1998	66.19779020504295
1999	66.59093126223445
2000	66.65865035283984
2001	67.7019817115023
2002	68.29317352071592
2003	68.0488768123295
2004	67.57065190132265
2005	67.32848000996957
2006	66.86351815856065
2007	66.73463244010783
2008	66.86493519200407
2009	69.31417763266695
2010	68.45890030922187
2011	67.81845040139007
2012	68.12907260385384
2013	68.13021780671168
2014	68.2231678088168
2015	69.34380814179268
2016	69.835489887565
2017	69.28401180540496
2018	68.90429254405565
2019	69.48908804642743
2020	70.21454333517674
2021	69.13405256251302