Year Percent of GDP 1997 64.145 1998 65.249 1999 59.924 2000 65.865 2001 70.026 2002 62.929 2003 64.649 2004 53.006 2005 62.006 2006 59.938 2007 65.854 2008 64.179 2009 63.053 2010 60.029 2011 56.977 2012 50.792 2013 53.084 2014 52.646 2015 59.825 2016 61.858 2017 70.031 2018 66.743 2019 67.318 2020 67.266 2021 66.893 2022 66.722 2023 66.599 2024 66.066