Year Percent of GDP (Units) 1998 38.097 1999 38.332 2000 41.262 2001 38.384 2002 39.370 2003 42.445 2004 39.359 2005 34.961 2006 34.739 2007 29.970 2008 32.462 2009 32.229 2010 35.434 2011 34.967 2012 35.879 2013 35.820 2014 34.838 2015 39.706 2016 47.538 2017 48.059 2018 50.784 2019 54.148 2020 63.019 2021 64.181 2022 65.412 2023 70.721 2024 70.705 2025 68.278 2026 65.710 2027 63.727 2028 61.851 2029 60.343