| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] over the [num ord] 15 years | 18 |
|
| 2 | [noun sg] over the [num ord] 15 year | 11 |
|
| 3 | [noun] over the next 15 year | 10 |
|
| 4 | [noun] over the last 15 year | 8 |
|
| 5 | [noun pl] over the [num ord] 15 year | 6 |
|
