Year % of GNI 2010 37.66427629299236 2011 36.02846741956778 2012 37.72971245710848 2013 38.28113153641636 2014 38.181726116384546 2015 38.56117831533489 2016 38.23437078352126 2017 38.88774368122896 2018 39.07394485939969 2019 37.93033380541892 2020 38.1496353336652 2021 40.337896504982794