Year % of GNI 2007 37.62597493972129 2008 38.24019816482638 2009 34.13036310032944 2010 36.0572374283376 2011 35.334606444239164 2012 30.247923568364754 2013 30.166436014123413 2014 27.873667817377157 2015 29.517304410863737 2016 28.984746319772167 2017 26.39809134736667 2018 26.10645494721201 2019 25.2368135310542 2020 17.926210718016417 2021 17.82004939225176 2022 22.233242698928965 2023 20.90787653573925