Year % of GDP 2001 36.86733371441287 2002 36.414408766334645 2003 37.69792935571007 2004 38.586920144491934 2005 39.77197669629693 2006 46.286656733708895 2007 53.99767313497357 2008 52.516578367078104 2009 51.498233664954604 2010 48.63690351336615 2011 48.73630883428271 2012 52.839752305157205 2013 57.30059187419829 2014 58.35710869532442 2015 57.63910796517828 2016 60.69511496487955 2017 60.142270212061575 2018 65.88074881077549 2019 67.89585802967088 2020 74.86407920509133 2021 70.88902397800831 2022 73.4422255553762 2023 78.7506896218746