| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] the past 25 years | 42 |
|
| 2 | in the [adj] 25 years | 17 |
|
| 3 | over the [adj] 25 years | 13 |
|
| 4 | for the [adj] 25 years | 5 |
|
