| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 | 
                                                                 
                                    
                                    25.7%
                                 
                                                             | 
                                                        
                    
| 1994 | 1 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    |
| 1999 | 1 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    |
| 2014 | 2 | 
                                                                 
                                    
                                    5.7%
                                 
                                                             | 
                                                        
                    |
| 2015 | 2 | 
                                                                 
                                    
                                    5.7%
                                 
                                                             | 
                                                        
                    |
| 2018 | 1 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    |
| 2019 | 1 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    |
| 2020 | 3 | 
                                                                 
                                    
                                    8.6%
                                 
                                                             | 
                                                        
                    |
| 2021 | 1 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    |
| 2022 | 4 | 
                                                                 
                                    
                                    11.4%
                                 
                                                             | 
                                                        
                    |
| 2023 | 5 | 
                                                                 
                                    
                                    14.3%
                                 
                                                             | 
                                                        
                    |
| 2024 | 4 | 
                                                                 
                                    
                                    11.4%
                                 
                                                             | 
                                                        
                    |
| 2025 | 1 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 79 |