| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [noun] over the past 15 | 5 |
|
| 2 | [noun] over the past 15 year | 14 |
|
| 3 | [noun] over the past 15 [noun pl] | 14 |
|
| 4 | [noun] over the past 15 [noun] | 14 |
|
| 5 | [noun] over the past 15 years | 14 |
|
