Year % of GNI 2005 43.9006551145225 2006 43.3658692425293 2007 40.2350936661635 2008 51.1530812837559 2009 26.9261992059114 2010 35.5691425540946 2011 42.802617165436 2012 41.5096949357578 2013 41.5733722759009 2014 38.193613007339 2015 25.3015647900319 2016 24.6754076740843 2017 32.3510825397383 2018 40.5941320927818 2019 37.5375169655355 2020 20.8389037726055 2021 30.7649803255582