a    Including Canary Islands, Ceuta and Melilla.
b    2017
c    2018
d    Data classified according to ISIC Rev. 4.
e    Estimate.
f    Calculated by the UN Statistics Division from national indices.
g    Break in the time series.
h    2016
i    Excluding water and waste management.
j    2014
k    Data refers to a 5-year period preceding the reference year.
l    2015
m    Data as at the end of December.
n    Population aged 16 to 74 years.
o    Users in the last 12 months.
p    Population aged 10 years and over.
q    Users in the last 3 months.
r    2004
s    Data include the Canary Islands.
t    Development Assistance Committee member (OECD).