Year % of GNI 2011 7.15949438986066 2012 6.76466956601294 2013 3.9666978796291 2014 9.32403894924653 2015 8.16568435818896 2016 11.2589800564227 2017 12.5870691381596 2018 18.9899753915468 2019 16.7012177955312 2020 15.3541249457311 2021 13.4418031828115