Year % of GNI 2010 16.5403442109591 2011 15.6399543625237 2012 20.0971836373438 2013 18.6221860562765 2014 17.3355475331513 2015 18.1140444859538 2016 14.940204728522 2017 20.8746658997954 2018 25.5208361563237 2019 22.8223224759795 2020 27.2120664930667 2021 27.1862915653353