Year % of GDP 1995 19.37518112791978 1996 18.322887169857626 1997 17.645651782878094 1998 17.33429088638995 1999 16.798659807569717 2000 16.05273600068405 2001 14.543060694928526 2002 14.30829805937844 2003 15.517050068936861 2004 16.429265741497883 2005 16.009207192109276 2006 16.30278157263068 2007 16.321490044698646 2008 16.097049482292306 2009 16.329585831161967 2010 16.343365161520616 2011 16.34315778226759 2012 16.73965843202155 2013 15.745285947221257 2014 17.110208920397614 2015 17.86906766914785 2016 18.48489508715981 2017 17.090983733055477 2018 16.753773560949277 2019 16.92498815814082 2020 16.47228524788764 2021 17.359200882300854 2022 17.81112125089193 2023 16.236063243206942