| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over the [num ord] 15 [noun pl] | 33 |
|
| 2 | over the [num ord] 15 years | 29 |
|
| 3 | over the [num ord] 15 year | 29 |
|
| 4 | over the next 15 [noun] | 17 |
|
| 5 | over the last 15 [noun] | 15 |
|
