Year Percent of GDP (Units) 1997 14.943 1998 8.821 1999 7.114 2000 9.166 2001 17.298 2002 18.933 2003 19.898 2004 26.156 2005 22.708 2006 21.735 2007 24.988 2008 26.420 2009 18.657 2010 17.600 2011 18.329 2012 19.269 2013 17.378 2014 16.522 2015 18.681 2016 18.078 2017 19.575 2018 22.655 2019 25.087 2020 24.188 2021 25.172 2022 26.513 2023 21.374 2024 22.671 2025 23.123 2026 23.274 2027 23.206 2028 23.193 2029 23.214