Year Percent of GDP 2000 19.393 2001 18.571 2002 18.078 2003 18.332 2004 18.363 2005 19.747 2006 21.088 2007 21.942 2008 22.216 2009 20.033 2010 21.091 2011 21.772 2012 22.363 2013 22.289 2014 22.402 2015 20.256 2016 18.8 2017 18.306 2018 19.477 2019 19.631 2020 19.922 2021 20.149 2022 20.166 2023 20.174 2024 20.196