| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | for the last six months | 29 |
|
| 2 | for the last two months | 11 |
|
| 3 | for the last 18 months | 11 |
|
| 4 | for the last three months | 10 |
|
| 5 | for the last eighteen months | 7 |
|
| 6 | for the last four months | 5 |
|
| 7 | for the last 6 months | 5 |
|
