$
US dollar
¥
Japanese yen
£
Pound sterling
€
Euro
mb/d
Million barrels per day
. .
Data not available
0
Nil or negligible
–
Irrelevant
.
Decimal point
I, II
Calendar half-years
Q1, Q4
Calendar quarters
Billion
Thousand million
Trillion
Thousand billion
s.a.a.r.
Seasonally adjusted at annual rates
n.s.a.
Not seasonally adjusted