Year Percent of GDP (Units) 1999 27.222 2000 26.564 2001 27.817 2002 27.598 2003 27.731 2004 26.612 2005 26.274 2006 26.827 2007 26.752 2008 26.292 2009 27.193 2010 27.400 2011 26.329 2012 27.678 2013 28.827 2014 29.096 2015 28.351 2016 29.668 2017 29.727 2018 30.321 2019 30.473 2020 32.727 2021 30.185 2022 30.188 2023 30.762 2024 30.542 2025 30.231 2026 29.982 2027 29.897 2028 29.877 2029 29.833