| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [num] year period | 71 |
|
| 2 | over a five year [noun sg] | 15 |
|
| 3 | over a two year [noun sg] | 11 |
|
| 4 | over a three year [noun sg] | 11 |
|
| 5 | over a ten year [noun sg] | 5 |
|
