| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                    
                                    0.9%
                                 | 
| 1 | 1-2 production performance indicators | 32 | 
                                    
                                    9.9%
                                 | 
| 2 | 3-9 production performance indicators | 155 | 
                                    
                                    48.1%
                                 | 
| 3 | 10 or more production performance indicators | 132 | 
                                    
                                    41%
                                 | 
| Sysmiss | 278 |