Year Percent of GDP 1999 26.469 2000 25.782 2001 27.044 2002 26.442 2003 27.685 2004 27.919 2005 28.195 2006 28.409 2007 28.883 2008 27.125 2009 28.055 2010 29.385 2011 28.275 2012 27.783 2013 29.5 2014 28.834 2015 28.772 2016 29.312 2017 29.795 2018 31.024 2019 30.929 2020 30.607 2021 29.864 2022 29.794 2023 29.581 2024 29.505