| Value | Category | Cases | |
|---|---|---|---|
| 1 | Months | 179 |
1.5%
|
| 2 | Years | 3396 |
28.3%
|
| 993 | Special | 834 |
6.9%
|
| 994 | 16 |
0.1%
|
|
| 996 | 65 |
0.5%
|
|
| 998 | 213 |
1.8%
|
|
| Sysmiss | 7302 |