| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] over the last 30 year | 18 |
|
| 2 | [noun] over the last 30 years | 18 |
|
| 3 | [noun sg] over the last 30 year | 11 |
|
| 4 | [noun pl] over the last 30 year | 6 |
|
