Year % of GNI 1970 0.5038543398960089 1971 0.644590857213565 1972 0.7867443591766301 1973 1.2427550425751521 1974 1.493056879312379 1975 1.8497007931072398 1976 1.9629641441456132 1977 1.840749834558781 1978 1.618265996416071 1979 1.6929394970226879 1980 1.6110746571117338 1981 1.226914250400725 2009 0.2703654402418963 2010 0.3594540238480093 2011 0.386644007799435 2012 0.380988095588488 2013 0.3350905415127183 2014 0.3155709160675452 2015 0.29026098462459055 2016 0.36328208604662654 2017 0.3508791651862 2018 0.40105296171908 2019 0.37013082313839496 2020 0.24366838250991293 2021 0.33593493464695673