Year Percent of GDP (Units) 2000 51.318 2001 75.509 2002 71.506 2003 65.160 2004 57.158 2005 50.196 2006 44.225 2007 37.759 2008 37.748 2009 43.212 2010 39.511 2011 35.912 2012 32.227 2013 30.892 2014 28.277 2015 27.163 2016 27.747 2017 27.777 2018 29.860 2019 32.390 2020 39.446 2021 40.384 2022 30.802 2023 28.882 2024 30.873 2025 31.009 2026 32.029 2027 32.083 2028 33.022 2029 33.596