Year Percent of GDP (Units) 1998 33.729 1999 27.297 2000 27.461 2001 25.963 2002 28.082 2003 28.421 2004 26.618 2005 26.329 2006 20.516 2007 24.742 2008 26.395 2009 18.893 2010 15.917 2011 18.311 2012 18.282 2013 17.226 2014 18.443 2015 20.676 2016 21.730 2017 23.618 2018 23.708 2019 24.332 2020 22.567 2021 25.505 2022 27.484 2023 26.535 2024 26.829 2025 26.987 2026 27.049 2027 27.067 2028 27.109 2029 27.149