| Value | Category | Cases | |
|---|---|---|---|
| 1 | Are taken directly from establishment records | 108 |
30%
|
| 2 | Are estimates computed with some precision | 110 |
30.6%
|
| 3 | Are arbitrary and unreliable numbers | 13 |
3.6%
|
| 4 | Are in some case taken from books and in some case estimates | 129 |
35.8%
|