| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 2012 | 4 | 
                                    
                                    4.5%
                                 | |
| 2013 | 1 | 
                                    
                                    1.1%
                                 | |
| 2014 | 1 | 
                                    
                                    1.1%
                                 | |
| 2018 | 5 | 
                                    
                                    5.6%
                                 | |
| 2020 | 8 | 
                                    
                                    9%
                                 | |
| 2021 | 9 | 
                                    
                                    10.1%
                                 | |
| 2022 | 24 | 
                                    
                                    27%
                                 | |
| 2023 | 18 | 
                                    
                                    20.2%
                                 | |
| 2024 | 18 | 
                                    
                                    20.2%
                                 | |
| 2025 | 1 | 
                                    
                                    1.1%
                                 | |
| Sysmiss | 274 |