Year Percent of GDP 2000 31.256 2001 32.612 2002 29.901 2003 31.13 2004 30.745 2005 31.669 2006 33.833 2007 31.952 2008 31.922 2009 32.454 2010 32.822 2011 32.719 2012 32.61 2013 32.765 2014 31.855 2015 32.163 2016 32.751 2017 31.476 2018 31.2 2019 30.88 2020 30.639 2021 30.363 2022 30.665 2023 30.923 2024 31.122