Year Percent of GDP (Units) 1996 23.286 1997 25.263 1998 27.453 1999 33.982 2000 37.988 2001 41.095 2002 47.545 2003 45.039 2004 41.482 2005 38.532 2006 35.969 2007 32.663 2008 32.382 2009 35.387 2010 36.497 2011 35.784 2012 33.967 2013 37.592 2014 43.319 2015 50.419 2016 49.796 2017 49.436 2018 53.584 2019 52.401 2020 65.674 2021 64.039 2022 60.055 2023 52.524 2024 54.412 2025 55.555 2026 55.695 2027 55.378 2028 55.165 2029 54.500