Year Percent of GDP (Units) 1999 40.377 2000 43.732 2001 42.277 2002 44.239 2003 42.691 2004 46.197 2005 50.032 2006 49.639 2007 48.757 2008 49.169 2009 56.660 2010 60.482 2011 60.266 2012 60.471 2013 60.408 2014 59.122 2015 58.180 2016 56.845 2017 55.955 2018 50.644 2019 47.909 2020 59.259 2021 60.230 2022 58.245 2023 56.747 2024 57.441 2025 58.180 2026 58.882 2027 59.675 2028 60.310 2029 60.726