Year % of GDP 1990 18.8646536473107 1991 21.4143370074283 1992 19.3649105959837 1993 19.1079809727352 1994 16.6512280436149 1995 16.5095925346317 1996 18.813004026423 1997 20.5441532008374 1998 22.3285857605711 1999 25.1877012660667 2000 26.4304332256043 2001 23.5600981244914 2002 12.8693802372281 2003 13.3339218935917 2004 26.27868021447 2005 27.1164931905142 2006 31.2137949993969 2007 37.1171394213765 2008 47.2831916712496 2009 47.0388659098777 2010 49.1202397153311 2011 51.8249067834847 2012 50.6216442958222 2013 51.9064783949216 2014 52.9216428286554 2015 53.6437340385249 2016 54.7197422843129 2017 52.6445006389973 2018 52.4114674494217 2019 50.7860197894509 2020 49.7983891666581 2021 46.2529956652638 2022 39.6490436119706 2023 34.7622984061931