Year Percent of GDP 1998 20.211 1999 19.625 2000 20.548 2001 21.585 2002 22.718 2003 24.934 2004 24.494 2005 24.977 2006 26.326 2007 26.102 2008 26.579 2009 25.585 2010 27.26 2011 25.879 2012 22.599 2013 23.082 2014 22.239 2015 23.76 2016 23.747 2017 23.547 2018 23.614 2019 23.6 2020 23.52 2021 23.393 2022 23.353 2023 23.291 2024 23.139