Year % of GDP 2002 29.594875059126853 2003 28.521763562851614 2004 28.348006004565324 2005 28.44672369195494 2006 28.133862632532146 2007 30.56666031943521 2008 36.01510349992484 2009 36.195264069472685 2010 38.608439334543604 2011 38.55636953350822 2012 41.45969922969676 2013 41.9773466041698 2014 45.38627121336717 2015 46.12970057955953 2016 44.951500240079035 2017 46.34711011902229 2018 45.691900819444975 2019 46.29125372566464 2020 45.20535201172921 2021 44.893440608900406 2022 47.26017034669404 2023 47.334025891692136