| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 19 | 
                                    
                                    5.2%
                                 | 
| 2009 | 1 | 
                                    
                                    0.3%
                                 | |
| 2013 | 1 | 
                                    
                                    0.3%
                                 | |
| 2016 | 1 | 
                                    
                                    0.3%
                                 | |
| 2017 | 1 | 
                                    
                                    0.3%
                                 | |
| 2018 | 4 | 
                                    
                                    1.1%
                                 | |
| 2019 | 1 | 
                                    
                                    0.3%
                                 | |
| 2020 | 16 | 
                                    
                                    4.4%
                                 | |
| 2021 | 28 | 
                                    
                                    7.7%
                                 | |
| 2022 | 36 | 
                                    
                                    9.9%
                                 | |
| 2023 | 129 | 
                                    
                                    35.4%
                                 | |
| 2024 | 120 | 
                                    
                                    33%
                                 | |
| 2025 | 7 | 
                                    
                                    1.9%
                                 | |
| Sysmiss | 1052 |