| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    
| 2000 | 2 | 
                                                                 
                                    
                                    4.8%
                                 
                                                             | 
                                                        
                    |
| 2006 | 1 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    |
| 2008 | 2 | 
                                                                 
                                    
                                    4.8%
                                 
                                                             | 
                                                        
                    |
| 2010 | 1 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    |
| 2012 | 1 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    |
| 2014 | 1 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    |
| 2015 | 1 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    |
| 2016 | 1 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    |
| 2018 | 3 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    |
| 2019 | 2 | 
                                                                 
                                    
                                    4.8%
                                 
                                                             | 
                                                        
                    |
| 2020 | 10 | 
                                                                 
                                    
                                    23.8%
                                 
                                                             | 
                                                        
                    |
| 2021 | 5 | 
                                                                 
                                    
                                    11.9%
                                 
                                                             | 
                                                        
                    |
| 2022 | 9 | 
                                                                 
                                    
                                    21.4%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 167 |