| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 50 | 
                                    
                                    51.5%
                                 | 
| 150 | 1 | 
                                    
                                    1%
                                 | |
| 350 | 1 | 
                                    
                                    1%
                                 | |
| 400 | 2 | 
                                    
                                    2.1%
                                 | |
| 450 | 1 | 
                                    
                                    1%
                                 | |
| 500 | 1 | 
                                    
                                    1%
                                 | |
| 550 | 1 | 
                                    
                                    1%
                                 | |
| 600 | 1 | 
                                    
                                    1%
                                 | |
| 1000 | 1 | 
                                    
                                    1%
                                 | |
| 1200 | 1 | 
                                    
                                    1%
                                 | |
| 1500 | 2 | 
                                    
                                    2.1%
                                 | |
| 1800 | 1 | 
                                    
                                    1%
                                 | |
| 2000 | 4 | 
                                    
                                    4.1%
                                 | |
| 2300 | 1 | 
                                    
                                    1%
                                 | |
| 3000 | 4 | 
                                    
                                    4.1%
                                 | |
| 3600 | 1 | 
                                    
                                    1%
                                 | |
| 4000 | 2 | 
                                    
                                    2.1%
                                 | |
| 4200 | 1 | 
                                    
                                    1%
                                 | |
| 4500 | 1 | 
                                    
                                    1%
                                 | |
| 5000 | 4 | 
                                    
                                    4.1%
                                 | |
| 6000 | 4 | 
                                    
                                    4.1%
                                 | |
| 6500 | 1 | 
                                    
                                    1%
                                 | |
| 7000 | 1 | 
                                    
                                    1%
                                 | |
| 8000 | 2 | 
                                    
                                    2.1%
                                 | |
| 10000 | 1 | 
                                    
                                    1%
                                 | |
| 12000 | 1 | 
                                    
                                    1%
                                 | |
| 15000 | 2 | 
                                    
                                    2.1%
                                 | |
| 20000 | 1 | 
                                    
                                    1%
                                 | |
| 23000 | 1 | 
                                    
                                    1%
                                 | |
| 40000 | 1 | 
                                    
                                    1%
                                 | |
| 50000 | 1 | 
                                    
                                    1%
                                 |