Year % of GNI 2002 23.334786999534323 2003 24.454504224059463 2004 28.77796953098688 2005 31.975434398051306 2006 33.31105890060889 2007 31.624097572678302 2008 32.84902407609817 2009 22.0038554112365 2010 26.729154723322427 2011 26.548546621755246 2012 28.575638139122546 2013 21.817457950987794 2014 19.555082963016353 2015 19.064320270875154 2016 18.005562391224935 2017 21.328296668614446 2018 23.2371828425243 2019 23.511790807916903 2020 20.582950020538856 2021 25.800952219984143