| for an unusually long time | 12 | temporal |
| extremely | 7 | degree |
| by historical standards | 7 | other |
| rate → be kept → low | 33 |
| rate → be remained → low | 6 |
| rate → be stayed → low | 4 |
| rate → keep → low | 4 |
| rate → be kept at → low levels | 4 |
| negative | neutral | positive |
| 0.204 | 0.604 | 0.192 |
| Raw frequency | 51 |
| Normalized frequency | 0.398 |
| Modifier score | 0.700 |
| Perplexity | 78.639 |