| blue number | = Preliminary data. |
|---|---|
| green number | = Revised data. |
| – | = Non-occurrence. |
| .. | = Not available. |
| … | = Confidential data. |
| x | = Not applicable. |
| 0 | = Less than half of unit. |
| __ , | | = Break in series (limited comparability). |
| empty space | = Block of not applicable items. |