| Value | Category | Cases | |
|---|---|---|---|
| 1 | 0-9 books | 368 |
15.5%
|
| 2 | 10-19 books | 321 |
13.5%
|
| 3 | 20-29 books | 290 |
12.2%
|
| 4 | 30+ books | 863 |
36.3%
|
| 99 | No books | 538 |
22.6%
|
| Sysmiss | 947 |