Year % of GNI 2008 21.1382807639221 2009 22.2626000039822 2010 19.9794381020292 2011 22.0988015245577 2012 24.98328948448 2013 25.860403231344 2014 20.1756786758182 2015 21.319085083963 2016 25.2300550916833 2017 28.7062335002871 2018 28.1589171838648 2019 28.2368955398275 2020 25.9553529518242 2021 26.7123337320312