Year % of GDP 2000 25.27956528693195 2001 25.311545893841654 2002 25.135408678045962 2003 24.836872645288082 2004 24.01199788258278 2005 24.26990116575579 2006 23.829185395324444 2007 23.15091159963745 2008 23.268667677755193 2009 21.738614391419723 2010 21.91920171638268 2011 21.70432695214607 2012 21.328571208506936 2013 20.434498766280694 2014 20.575083990272216 2015 19.928022373976855 2016 19.590303199645682 2017 19.50020205604885 2018 19.098247167023843 2019 18.516454400011405 2020 17.658179047866053 2021 17.640084696104452 2022 17.229379413152376 2023 16.21797581767338