Year Percent of GDP 1995 37.876 1996 28.613 1997 31.158 1998 35.941 1999 35.887 2000 30.215 2001 28.088 2002 29.35 2003 28.077 2004 28.457 2005 29.066 2006 29.13 2007 29.595 2008 27.884 2009 32.541 2010 37.107 2011 37.367 2012 40.584 2013 38.147 2014 38.856 2015 38.34 2016 39.524 2017 37.942 2018 34.112 2019 37.47 2020 35.431 2021 35.574 2022 35.382 2023 35.152 2024 34.594