a    Projected estimate (medium fertility variant).
b    2019
c    Excludes irrigation canals and landscaping care.
d    Excludes publishing activities.
e    Gas distribution is included in Wholesale and retail trade.
f    Includes irrigation canals.
g    Excludes repair of personal and household goods.
h    Estimate.
i    2020
j    Urban areas.
k    Data refers to a 5-year period preceding the reference year.
l    Data as at the end of December.
m    Data revision.
n    2018
o    2014
p    Data are as at 1 January of reporting year.
q    Population aged 3 years and over.
r    Users in the last 6 months.
s    Do not correspond exactly to Frascati Manual recommendations.
t    Including overseas territories.
u    Oil and coal trade statistics include overseas territories.
v    Break in the time series.
w    Development Assistance Committee member (OECD).
x    2017