| Value | Category | Cases | |
|---|---|---|---|
| 0 | 9 |
2.3%
|
|
| 1 | 314 |
81.6%
|
|
| 2 | 52 |
13.5%
|
|
| 3 | 7 |
1.8%
|
|
| 4 | 3 |
0.8%
|
|
| Sysmiss | 1995 |