| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. At the time of sale | 608 |
94.3%
|
| 2 | 2. Within one week | 24 |
3.7%
|
| 3 | 3. Within one month | 7 |
1.1%
|
| 4 | 4. One month or more | 6 |
0.9%
|
| Sysmiss | 7899 |