a    2017
b    2019
c    2018
d    2014
e    Estimate.
f    2016
g    Areas not elsewhere specified.
h    Data refers to a 5-year period preceding the reference year.
i    Data as at the end of December.
j    Data revision.
k    2008
l    2009
m    2012
n    Data are as at 1 January of reporting year.
o    Population aged 18 years and over.
p    Users in the last month.