| Value | Category | Cases | |
|---|---|---|---|
| 1 | Are taken directly from establishment records | 269 | 
                                                                 
                                    
                                    26.6%
                                 
                                                             | 
                                                        
                    
| 2 | Are estimates computed with some precision | 121 | 
                                                                 
                                    
                                    11.9%
                                 
                                                             | 
                                                        
                    
| 3 | Are arbitrary and unreliable numbers | 110 | 
                                                                 
                                    
                                    10.9%
                                 
                                                             | 
                                                        
                    
| 4 | Are in some case taken from books and in some case estimates | 513 | 
                                                                 
                                    
                                    50.6%
                                 
                                                             |