Year % of GNI 2007 29.4001497901492 2008 28.8179325136185 2009 25.7638076493359 2010 26.6578591602231 2011 26.3056319750696 2012 21.3639814200985 2013 21.7676345667484 2014 19.5279668192678 2015 21.1360942055324 2016 25.8884024002148 2017 23.3114947141091 2018 27.0545229939552 2019 27.8579899530761 2020 25.850429649415 2021 23.7545784484128