Year % of GNI 2005 5.915337493408724 2006 6.3318267719513885 2007 10.198950001082371 2008 9.641956687268491 2009 11.636697478775984 2010 16.32654935042134 2011 18.23156195883213 2012 18.53175101385045 2013 14.79043140337402 2014 13.99704249747562 2015 12.42540396152052 2016 14.077815205563542 2017 15.363286175668305 2018 17.66623732183173 2019 17.620453130861105 2020 21.300480789995895 2021 17.904709163268876 2022 15.692343043761738