| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] the last thirty years | 35 |
|
| 2 | [noun sg] [prep] the [num ord] thirty years | 27 |
|
| 3 | [noun] over the [num ord] thirty years | 16 |
|
| 4 | [noun pl] [prep] the [num ord] thirty years | 13 |
|
| 5 | [noun] for the [num ord] thirty years | 9 |
|
| 6 | [noun] of the [num ord] thirty years | 7 |
|
| 7 | [noun] in the [num ord] thirty years | 7 |
|
| 8 | [noun] [prep] the next thirty years | 6 |
|
