Year Percent of GDP 1998 36.388 1999 35.863 2000 33.711 2001 32.365 2002 31.756 2003 31.361 2004 32.481 2005 33.484 2006 33.41 2007 33.695 2008 33.464 2009 35.784 2010 36.544 2011 35.64 2012 37.353 2013 36.707 2014 36.128 2015 36.244 2016 36.206 2017 35.603 2018 36.861 2019 35.913 2020 35.852 2021 34.667 2022 34.705 2023 34.661 2024 34.699