Year % of GDP 2009 21.7870346979082 2010 21.091519972966 2011 20.9325128845535 2012 22.8565539094754 2013 25.0996039083892 2014 22.6256429101556 2015 22.5534509061815 2016 22.1193452819282 2017 19.3527551663392 2018 18.7432134166838 2019 18.0543478174691 2020 18.8149834167969 2021 17.4069585680857 2022 15.0634707325861 2023 16.4051715646857