| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 26 | 
                                    
                                    4.2%
                                 | 
| 1 | Never, it always has enough on hand | 203 | 
                                    
                                    33.2%
                                 | 
| 2 | Rarely | 197 | 
                                    
                                    32.2%
                                 | 
| 3 | Sometimes | 144 | 
                                    
                                    23.5%
                                 | 
| 4 | Frequently, at least once every three months | 42 | 
                                    
                                    6.9%
                                 |