Year Percent of GDP 1999 21.14 2000 19.545 2001 20.282 2002 20.702 2003 19.757 2004 19.611 2005 22.817 2006 24.239 2007 23.376 2008 23.555 2009 25.898 2010 30.137 2011 30.423 2012 31.661 2013 32.842 2014 34.502 2015 39.36 2016 40.702 2017 41.609 2018 48.64 2019 51.38 2020 46.059 2021 42.886 2022 40.559 2023 39.246 2024 39.705