Year Percent of GDP (Units) 1995 21.952 1996 22.735 1997 21.963 1998 21.532 1999 24.129 2000 24.259 2001 21.391 2002 22.774 2003 21.271 2004 21.290 2005 22.045 2006 21.729 2007 24.686 2008 35.593 2009 34.296 2010 35.396 2011 39.615 2012 43.230 2013 46.775 2014 45.997 2015 44.118 2016 44.170 2017 40.523 2018 40.954 2019 39.774 2020 40.240 2021 37.390 2022 38.727 2023 39.718