Year % of GDP 2001 36.6835662057379 2002 36.0320656003149 2003 37.1910463818441 2004 37.8143681852083 2005 38.8417580655353 2006 44.7293531580234 2007 52.270420067944 2008 51.291832674053 2009 50.3382201748979 2010 47.4622470777193 2011 47.3092310306697 2012 51.2756482307446 2013 54.7226868179144 2014 55.0869372049161 2015 54.5936002238152 2016 57.8354023642267 2017 57.7901974979755 2018 62.8924975456818 2019 64.5320524388135 2020 71.3174508703798 2021 67.7186971068827 2022 70.0777939782582 2023 75.5318875339289