Year Percent of GDP (Units) 2001 37.304 2002 41.519 2003 36.859 2004 37.671 2005 39.698 2006 39.324 2007 39.350 2008 39.359 2009 38.494 2010 39.057 2011 39.729 2012 40.253 2013 39.569 2014 38.482 2015 40.349 2016 41.010 2017 39.791 2018 40.501 2019 41.776 2020 38.046 2021 40.431 2022 42.572 2023 39.962 2024 40.866 2025 41.210 2026 41.287 2027 41.314 2028 41.482 2029 41.602