| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    8.7%
                                 | 
| 1995 | 1 | 
                                    
                                    4.3%
                                 | |
| 1997 | 1 | 
                                    
                                    4.3%
                                 | |
| 2003 | 1 | 
                                    
                                    4.3%
                                 | |
| 2006 | 1 | 
                                    
                                    4.3%
                                 | |
| 2010 | 1 | 
                                    
                                    4.3%
                                 | |
| 2011 | 1 | 
                                    
                                    4.3%
                                 | |
| 2020 | 1 | 
                                    
                                    4.3%
                                 | |
| 2021 | 1 | 
                                    
                                    4.3%
                                 | |
| 2022 | 4 | 
                                    
                                    17.4%
                                 | |
| 2023 | 6 | 
                                    
                                    26.1%
                                 | |
| 2024 | 3 | 
                                    
                                    13%
                                 | |
| Sysmiss | 127 |