| Value | Category | Cases | |
|---|---|---|---|
| 0 | Did not change | 1038 |
30.1%
|
| 1 | Once | 1882 |
54.6%
|
| 2 | Twice | 446 |
13%
|
| 3 | Thrice or more | 77 |
2.2%
|
| 9 | 1 |
0%
|
|
| Sysmiss | 1873 |