Year % of GNI 2009 4.513765686251662 2010 0.47223032124005526 2011 0.4346047328070777 2012 0.4065642598936857 2013 0.39557459547464885 2014 0.37472223560999607 2015 0.3726819790770055 2016 0.4330166127574847 2017 0.4157576233397628 2018 0.3991801871790555 2019 0.42212429862066875 2020 0.480218874882364 2021 0.4599076327835968 2022 0.5116902369207613