Year % of GDP 2001 23.43150403908614 2002 22.698849881562744 2003 18.3742526953748 2004 18.233963344657283 2005 18.557178645207784 2006 20.873207410048966 2007 25.246601576761147 2008 27.01485411753949 2009 25.37638018924917 2010 23.14234947963551 2011 21.196423032535826 2012 21.212359349698882 2013 30.657668044388114 2014 32.98753891211435 2015 34.259371488161364 2016 35.3696207833534 2017 34.26594156234904 2018 32.886483616691706 2019 32.829293030754116 2020 34.60925800467623 2021 35.68981501185783 2022 34.37063132193041 2023 33.88606524328478