Year % of GDP 1994 18.102690663074778 1995 18.08832001937846 1996 18.33455918474143 1997 17.45775651723917 1998 18.657841141030847 1999 16.96661980187996 2000 17.61841541672888 2001 17.56798182616345 2002 16.660178591755297 2003 17.32941192883172 2004 18.071948557780786 2005 18.596838079954843 2006 19.370067448083844 2007 20.967869659927697 2008 23.020120624670763 2009 23.327073059920608 2010 21.156536776042174 2011 21.4665834146151 2012 21.490082303678896 2013 21.996002778766275 2014 22.55079162796189 2015 22.090018171352284 2016 21.33918558004611 2017 21.440254284031585 2018 20.295086447770196 2019 21.04591215760589 2020 20.48499716171655 2021 19.94822937199952 2022 20.42095268737981 2023 19.79299861320143