Footnotes  
a    2017
b    2018
c    Estimate.
d    Calculated by the UN Statistics Division from national indices.
e    2016
f    Data refers to a 5-year period preceding the reference year.
g    2015
h    Including refugees.
i    Data as at the end of December.
j    2004
k    2011
l    2001
m    2002
n    2014
o    Arrivals by air.