| Value | Category | Cases | |
|---|---|---|---|
| 1 | Only this year's production | 122 | 
                                    
                                    51.3%
                                 | 
| 2 | Only previous year's production | 40 | 
                                    
                                    16.8%
                                 | 
| 3 | Mainly this year's production | 75 | 
                                    
                                    31.5%
                                 | 
| 4 | Mainly last year's production | 1 | 
                                    
                                    0.4%
                                 |