| Value | Category | Cases | |
|---|---|---|---|
| 1 | Regular and available for all types | 293 | 
                                                                 
                                    
                                    62.3%
                                 
                                                             | 
                                                        
                    
| 2 | A few regularly available others at specified periods | 14 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    
| 3 | Irregular supply | 18 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    
| 4 | No supply | 145 | 
                                                                 
                                    
                                    30.9%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 44 |