a    Calculated by the UN Statistics Division.
b    2017
c    Estimate.
d    2018
e    Data refers to a 5-year period preceding the reference year.
f    2015
g    Including Sudan.
h    Data is for 2015, or latest available data from 2010 onwards.
i    2016
j    Including regional aid disbursements in addition to the disbursements made to individual countries and areas.