Year Percent of GDP (Units) 2000 136.425 2001 127.387 2002 159.088 2003 171.969 2004 172.738 2005 136.980 2006 130.255 2007 129.613 2008 102.515 2009 25.690 2010 46.912 2011 42.706 2012 41.430 2013 37.858 2014 37.971 2015 39.926 2016 46.119 2017 46.902 2018 52.971 2019 59.988 2020 65.965 2021 66.564 2022 68.359 2023 62.841 2024 72.664 2025 62.683 2026 56.421 2027 51.719 2028 50.873 2029 48.970