Year Percent of GDP (Units) 2002 20.527 2003 21.355 2004 21.263 2005 22.006 2006 19.800 2007 23.705 2008 27.068 2009 23.470 2010 22.473 2011 21.234 2012 21.912 2013 19.809 2014 21.260 2015 22.870 2016 21.512 2017 24.088 2018 18.847 2019 20.248 2020 24.546 2021 22.070 2022 21.718 2023 23.430 2024 22.297 2025 21.897 2026 21.691 2027 21.640 2028 21.751 2029 21.718