| Value | Category | Cases | |
|---|---|---|---|
| 1 | No books | 36 |
1.3%
|
| 2 | 1-5 books | 798 |
29.2%
|
| 3 | 6-10 books | 647 |
23.7%
|
| 4 | 11-25 books | 535 |
19.6%
|
| 5 | >25 books | 718 |
26.3%
|
| Sysmiss | 593 |