| .. | Data not available |
| ... | Not applicable |
| – | Void or zero |
| — | Negligible data |
| p | Preliminary data |
| r | Revised data |
| e | Estimated data |
| x | Confidential |
| F | Data unreliable |
| n.e.s. | Not elsewhere specified |
| p.-y. | Person-year |
| f.t.e | Full-time equivalent |
| ‰ | Per thousand |
| kg | Kilogramme |
| l | Liter |
| n | Number |
| t | Metric ton |
| $ | In dollars |
| k and '000 | In thousands |
| M and '000 000 | In millions |
| G | In billions |