Year % of GDP 1990 14.36283466057113 1991 14.167398772362283 1992 15.728181179378058 1993 16.850861794743963 1994 18.858198004390882 1995 16.084655207968108 1996 18.25852338502391 1997 16.392176635660213 1998 18.184307985636917 1999 17.957006356226785 2000 18.524369629942143 2001 18.400871175074997 2002 18.456047807734983 2003 19.360263847372856 2004 20.155470828504253 2005 20.265390271033944 2006 21.162344703322013 2007 22.290032748294518 2008 22.48719294715623 2009 22.049987278979327 2010 22.96255154116874 2011 23.304196408890967 2012 22.87895363099492 2013 24.583196767462535 2014 25.57210157161312 2015 25.76302913938926 2016 25.68181001604448 2017 25.16958147046967 2018 24.860264411018658 2019 25.152303717226655 2020 23.69682719627783 2021 23.768493377556705 2022 23.595503277134853 2023 22.429574815157153