| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | in the [adj] twenty years | 64 |
|
| 2 | in the [num ord] twenty years | 50 |
|
| 3 | in the last twenty years | 40 |
|
| 4 | in the last twenty years | 40 |
|
| 5 | in the [adj] twenty years | 14 |
|
| 6 | in the past twenty years | 13 |
|
| 7 | in the past twenty years | 13 |
|
| 8 | in the next twenty years | 9 |
|
| 9 | in the next twenty years | 9 |
|
