Year % of GDP 2000 2.76476121 2001 2.94435692 2002 3.13669062 2003 3.76656032 2004 4.34165335 2005 3.87814832 2006 3.70458078 2007 3.29873323 2008 3.58380818 2009 3.8994081 2010 3.61771655 2011 3.34342408 2012 4.30390453 2013 3.80453491 2014 3.28326321 2015 3.19531894 2016 3.14783049 2017 2.99721408 2018 2.9355917 2019 2.78261447 2020 3.64121318 2021 4.37961721