Year Percent of GDP (Units) 2000 37.291 2001 37.705 2002 31.394 2003 30.916 2004 30.017 2005 25.830 2006 23.178 2007 19.920 2008 20.138 2009 23.471 2010 26.408 2011 29.062 2012 32.426 2013 35.248 2014 38.122 2015 41.050 2016 42.083 2017 43.778 2018 46.591 2019 50.596 2020 62.075 2021 63.042 2022 66.422 2023 69.505 2024 72.508 2025 75.465 2026 77.790 2027 79.833 2028 81.860 2029 83.888