Year % of GNI 2013 27.766751986264126 2014 26.795826637292535 2015 28.85692052600339 2016 25.040018717917423 2017 21.163896729619136 2018 21.825082547985048 2019 21.179138799582677 2020 12.86553958213389 2021 9.201561294447552 2022 18.20743647833251