| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] the last 40 years | 17 |
|
| 2 | [noun sg] [prep] the [num ord] 40 years | 15 |
|
| 3 | [noun] over the [num ord] 40 years | 11 |
|
| 4 | [noun] [prep] the next 40 years | 8 |
|
| 5 | [noun pl] [prep] the [num ord] 40 years | 8 |
|
| 6 | [noun] of the [num ord] 40 years | 6 |
|
