| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] the past 15 years | 28 |
|
| 2 | [noun] [prep] the past 15 years | 28 |
|
| 3 | [noun] [prep] the past 15 years | 28 |
|
| 4 | [noun sg] [prep] the past 15 years | 21 |
|
| 5 | [noun] over the past 15 years | 14 |
|
| 6 | [noun] over the past 15 years | 14 |
|
| 7 | [noun] for the past 15 years | 7 |
|
| 8 | [noun] for the past 15 years | 7 |
|
| 9 | [noun pl] [prep] the past 15 years | 5 |
|
