| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] over the [num ord] 20 years | 34 |
|
| 2 | [noun] over the [adj] 20 years | 30 |
|
| 3 | [noun sg] over the [adj] 20 years | 30 |
|
| 4 | [noun] over the past 20 years | 29 |
|
| 5 | [noun] over the past 20 years | 29 |
|
| 6 | [noun pl] over the [adj] 20 years | 25 |
|
| 7 | [noun] over the next 20 years | 18 |
|
| 8 | [noun] over the next 20 years | 18 |
|
| 9 | [noun] over the last 20 years | 16 |
|
| 10 | [noun] over the last 20 years | 16 |
|
| 11 | [noun prp] over the [adj] 20 years | 8 |
|
