Year Percent of GDP 1998 9.597 1999 10.393 2000 8.445 2001 8.316 2002 8.323 2003 8.927 2004 8.933 2005 10.318 2006 11.145 2007 12.856 2008 13.5 2009 15.925 2010 20.14 2011 26.444 2012 30.125 2013 31.469 2014 32.056 2015 33.552 2016 35.552 2017 35.313 2018 37.17 2019 36.26 2020 36.771 2021 36.712 2022 36.674 2023 36.631 2024 36.283