Year Percent of GDP 2000 25.203 2001 25.211 2002 24.83 2003 25.428 2004 25.411 2005 28.173 2006 27.593 2007 27.175 2008 28.672 2009 31.709 2010 31.447 2011 30.877 2012 31.368 2013 31.594 2014 31.852 2015 32.927 2016 32.663 2017 32.633 2018 33.555 2019 34.593 2020 34.716 2021 34.637 2022 34.628 2023 34.618 2024 34.596