| Typicality: | 0.530 |
| Saliency: | 0.412 |
| each year | 16 | temporal |
| annually | 11 | temporal |
| at its peak | 2 | temporal |
| case → occur in → the united states | 60 |
| case → happen in → the united states | 5 |
| case → arise in → the united states | 3 |
| case → occur to → the united states | 3 |
| negative | neutral | positive |
| 0.478 | 0.488 | 0.034 |
| Raw frequency | 71 |
| Normalized frequency | 0.412 |
| Modifier score | 0.821 |
| Perplexity | 37.997 |