Footnotes  
a    2017
b    2019
c    2018
d    Estimate.
e    2016
f    Data refers to a 5-year period preceding the reference year.
g    Including refugees.
h    Data as at the end of December.
i    2013
j    Data are as at 1 January of reporting year.
k    Users in the last 3 months.
l    Break in the time series.
m    Partial data.