a    Projected estimate (medium fertility variant).
b    2015
c    Amsterdam is the capital and The Hague is the seat of government.
d    2017
e    2016
f    Data classified according to ISIC Rev. 4.
g    Estimate.
h    2014
i    Data refers to a 5-year period preceding the reference year.
j    Data as at the end of December.
k    Users in the last 12 months.
l    Population aged 16 to 74 years.
m    Population aged 12 years and over.
n    Provisional data.
o    2004
p    Development Assistance Committee member (OECD).