Year Percent of GDP 1995 44.811 1996 43.366 1997 42.255 1998 40.359 1999 40.581 2000 39.998 2001 38.002 2002 37.051 2003 37.202 2004 35.508 2005 36.892 2006 35.17 2007 34.39 2008 34.509 2009 36.28 2010 34.66 2011 36.54 2012 36.285 2013 38.721 2014 39.333 2015 42.529 2016 39.229 2017 39.415 2018 39.151 2019 39.21 2020 39.299 2021 38.603 2022 38.472 2023 38.583 2024 37.556