Year Percent of GDP 2000 25.384 2001 23.733 2002 23.117 2003 23.852 2004 23.656 2005 23.845 2006 21.324 2007 21.352 2008 21.693 2009 22.477 2010 22.354 2011 23.323 2012 24.039 2013 24.15 2014 24.538 2015 25.567 2016 26.87 2017 26.972 2018 28.382 2019 29.11 2020 31.266 2021 29.453 2022 30.326 2023 31.291 2024 31.839