Year % of GDP 2000 3.41529942 2001 4.23551702 2002 4.68907642 2003 5.34231472 2004 5.7373414 2005 6.32282543 2006 7.598279 2007 6.88427973 2008 5.55704737 2009 5.06306362 2010 5.22392178 2011 5.0559845 2012 5.01779366 2013 4.64643383 2014 4.01492071 2015 3.64969945 2016 3.96350336 2017 4.08257437 2018 4.16191673 2019 3.88136053 2020 2.93978429 2021 3.36136484