a    Projected estimate (medium fertility variant).
b    2015.
c    2016.
d    Data classified according to ISIC Rev. 4.
e    Estimate.
f    2014.
g    Excluding water and waste management.
h    Data refers to a 5-year period preceding the reference year.
i    Data as at the end of December.
j    Ireland has reviewed and improved its data collection as part of the transition to SHA 2011 leading to more complete SHA 2011 data than available under SHA 1.0
k    2013.
l    Population aged 16 to 74 years.
m    2004.
n    Including tourists from Northern Ireland.
o    Break in the time series.
p    Development Assistance Committee member (OECD)
q    Provisional data.