| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over the [num ord] few decades | 29 |
|
| 2 | over the [adj] few decades | 15 |
|
| 3 | over the last few decades | 15 |
|
| 4 | over the past few decades | 15 |
|
| 5 | over the past few decades | 15 |
|
| 6 | over the last few decades | 15 |
|
| 7 | over the next few decades | 14 |
|
| 8 | over the next few decades | 14 |
|
