Notations used in the Quarterly Review
| e | estimated |
| lhs, rhs | left-hand scale, right-hand scale |
| billion | thousand million |
| ... | not available |
| . | not applicable |
| - | nil or negligible |
| $ | US dollar unless specified otherwise |
Differences in totals are due to rounding.
The term "country" as used in this publication also covers territorial entities that are not states as understood by international law and practice but for which data are separately and independently maintained.