Year Percent of GDP (Units) 1997 54.915 1998 50.492 1999 48.722 2000 56.613 2001 58.913 2002 55.215 2003 52.904 2004 54.524 2005 85.512 2006 61.355 2007 67.518 2008 64.566 2009 63.312 2010 59.494 2011 56.000 2012 53.332 2013 55.169 2014 49.357 2015 56.431 2016 57.015 2017 63.934 2018 60.613 2019 65.765 2020 68.095 2021 70.094 2022 66.325 2023 62.007 2024 68.430 2025 66.917 2026 67.858 2027 70.704 2028 69.560 2029 68.764