Year Percent of GDP 2001 32.254 2002 29.902 2003 29.288 2004 29.447 2005 30.786 2006 31.645 2007 31.728 2008 30.657 2009 28.371 2010 29.024 2011 29.314 2012 29.317 2013 31.441 2014 31.308 2015 31.466 2016 31.086 2017 30.939 2018 30.862 2019 31.081 2020 31.466 2021 31.558 2022 31.749 2023 32.013 2024 32.317