Year % of GDP 2005 2.2089239061179264 2006 2.018143356828636 2007 2.198557854801969 2008 1.9850345292614937 2009 2.105151325006351 2010 2.1240805029858896 2011 1.869371074161621 2012 2.0204505726177673 2013 2.000424985895096 2014 2.202323044570568 2015 2.3392883356288485 2016 2.352644753152182 2017 2.6445353383722994 2018 2.477615777227289 2019 2.5324217791847876 2020 2.934076887803419 2021 2.890583680245702 2022 2.2796133586441756 2023 2.3730950626550267