Year Percent of GDP (Units) 1995 41.406 1996 44.322 1997 45.544 1998 46.976 1999 47.992 2000 44.873 2001 46.092 2002 48.616 2003 52.397 2004 54.903 2005 57.456 2006 56.244 2007 53.407 2008 53.153 2009 60.032 2010 61.954 2011 60.070 2012 59.366 2013 58.421 2014 54.869 2015 52.172 2016 49.284 2017 45.503 2018 42.802 2019 40.320 2020 45.691 2021 46.793 2022 47.067 2023 46.395 2024 46.434 2025 45.724 2026 45.009 2027 44.346 2028 43.645 2029 43.023