Year Percent of GDP 1996 8.129 1997 8.693 1998 8.048 1999 10.004 2000 10.229 2001 9.986 2002 10.499 2003 9.58 2004 10.303 2005 11.948 2006 12.78 2007 15.13 2008 15.885 2009 15.619 2010 17.108 2011 15.9 2012 17.155 2013 18.75 2014 20.076 2015 19.626 2016 20.835 2017 22.112 2018 22.17 2019 22.116 2020 21.652 2021 21.409 2022 21.212 2023 21.049 2024 21.101