Year % of GDP 2011 16.345166457894734 2012 16.826865825 2013 16.54986879904306 2014 15.93282087837838 2015 19.729307027450982 2016 21.504535366906474 2017 18.44670780412371 2018 17.886891115015974 2019 22.308634185897436 2020 21.325153305555553 2021 21.5449264 2022 20.218986933333337