Year Percent of GDP 2000 22.569 2001 22.07 2002 23.072 2003 21.999 2004 20.764 2005 20.079 2006 36.604 2007 18.886 2008 18.79 2009 15.75 2010 15.634 2011 17.744 2012 18.694 2013 17.629 2014 18.895 2015 18.77 2016 18.237 2017 17.475 2018 18.392 2019 18.094 2020 17.419 2021 17.418 2022 17.44 2023 17.401 2024 17.378