| Value | Category | Cases | |
|---|---|---|---|
| 1 | Are taken directly from establishment records | 170 | 
                                                                 
                                    
                                    29.3%
                                 
                                                             | 
                                                        
                    
| 2 | Are estimates computed with some precision | 339 | 
                                                                 
                                    
                                    58.4%
                                 
                                                             | 
                                                        
                    
| 3 | Are arbitrary and unreliable numbers | 37 | 
                                                                 
                                    
                                    6.4%
                                 
                                                             | 
                                                        
                    
| 4 | Are in some case taken from books and in some case estimates | 34 | 
                                                                 
                                    
                                    5.9%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1 |