Year Percent of GDP 1997 31.914 1998 30.558 1999 32.537 2000 34.399 2001 31.48 2002 32.951 2003 35.928 2004 34.491 2005 32.704 2006 30.945 2007 32.026 2008 32.833 2009 30.934 2010 30.1 2011 29.382 2012 29.459 2013 27.833 2014 27.519 2015 28.747 2016 28.406 2017 29.101 2018 28.544 2019 29.906 2020 29.895 2021 29.804 2022 29.804 2023 29.804 2024 29.804