Year Percent of GDP (Units) 1995 39.527 1996 38.636 1997 35.805 1998 38.903 1999 40.655 2000 36.366 2001 34.967 2002 35.874 2003 35.036 2004 34.060 2005 33.718 2006 33.437 2007 33.738 2008 39.451 2009 45.852 2010 40.274 2011 37.425 2012 39.246 2013 38.424 2014 37.764 2015 39.525 2016 39.397 2017 39.236 2018 39.271 2019 39.132 2020 44.871 2021 41.889 2022 39.776 2023 43.140 2024 44.265 2025 43.759 2026 44.005 2027 43.218 2028 43.218 2029 43.218