| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a two year period | 24 |
|
| 2 | a five year period | 23 |
|
| 3 | a three year period | 20 |
|
| 4 | a ten year period | 10 |
|
| 5 | a one year period | 9 |
|
| 6 | a 5 year period | 6 |
|
| 7 | a 10 year period | 5 |
|
