Year Percent of GDP 1995 29.703 1996 29.488 1997 29.394 1998 30.53 1999 30.266 2000 32.731 2001 33.608 2002 33.291 2003 34.479 2004 34.926 2005 37.464 2006 38.086 2007 40.792 2008 39.091 2009 36.459 2010 37.322 2011 36.66 2012 36.354 2013 36.734 2014 39.793 2015 38.983 2016 38.012 2017 38.876 2018 39.565 2019 38.412 2020 37.649 2021 37.389 2022 37.361 2023 37.353 2024 37.643