Year Percent of GDP (Units) 1995 19.928 1996 19.295 1997 19.138 1998 16.432 1999 19.304 2000 23.939 2001 21.423 2002 23.512 2003 22.316 2004 23.232 2005 22.706 2006 24.650 2007 27.344 2008 36.161 2009 30.582 2010 34.010 2011 39.487 2012 40.390 2013 38.604 2014 37.947 2015 37.245 2016 33.872 2017 34.748 2018 38.148 2019 36.303 2020 32.861 2021 35.806 2022 38.771 2023 36.247