Year Percent of GDP 2000 148.174 2001 163.19 2002 163.225 2003 171.422 2004 169.659 2005 178.986 2006 183.074 2007 168.986 2008 160.888 2009 144.183 2010 136.915 2011 133.888 2012 130.417 2013 135.443 2014 137.824 2015 140.714 2016 146.149 2017 148.958 2018 150.92 2019 157.808 2020 162.744 2021 166.599 2022 169.305 2023 171.25 2024 173.1