| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. At the time of sale | 3722 |
96.4%
|
| 2 | 2. Within one week | 101 |
2.6%
|
| 3 | 3. Within one month | 14 |
0.4%
|
| 4 | 4. One month or more | 24 |
0.6%
|
| Sysmiss | 4683 |