| Value | Category | Cases | |
|---|---|---|---|
| 1 | Always available | 1097 | 
                                    
                                    45.1%
                                 | 
| 2 | Mostly available | 676 | 
                                    
                                    27.8%
                                 | 
| 3 | Sometimes available | 518 | 
                                    
                                    21.3%
                                 | 
| 4 | Rarely available | 140 | 
                                    
                                    5.8%
                                 | 
| Sysmiss | 2725 |