Year Percent of GDP 1997 6.013 1998 4.241 1999 4.669 2000 8.635 2001 21.253 2002 17.243 2003 14.897 2004 16.68 2005 14.303 2006 12.429 2007 8.751 2008 6.373 2009 12.622 2010 11.453 2011 10.063 2012 8.18 2013 11.381 2014 10.929 2015 15.109 2016 14.982 2017 14.355 2018 17.89 2019 18.056 2020 19.073 2021 19.523 2022 19.97 2023 20.367 2024 20.539