a    Projected estimate (medium fertility variant).
b    2015.
c    2016.
d    At factor cost.
e    Estimate.
f    Series linked to former series.
g    2014.
h    Prior to 2008, special trade.
i    Imports exclude petroleum imported without stated value. Exports cover domestic exports.
j    Data refers to a 5-year period preceding the reference year.
k    Including refugees.
l    Data as at the end of December.
m    2009.
n    2008.
o    2004.
p    2011.
q    Population aged 6 years and over.
r    Government only.
s    Partial data.
t    Excluding business enterprise.
u    Excluding private non-profit.