Year	% of GNI
1990	1.05944879211405
2013	0.462299233481694
2014	0.438215008064801
2015	0.425996055151823
2016	0.430650506834466
2017	0.442850402711213
2018	0.444149402061446
2019	0.436286386451587
2020	0.429279807492103
2021	0.417209367958526