| Value | Category | Cases | |
|---|---|---|---|
| 2014 | 180 | 
                                    
                                    24.3%
                                 | |
| 2015 | 192 | 
                                    
                                    25.9%
                                 | |
| 2016 | 182 | 
                                    
                                    24.6%
                                 | |
| 2017 | 186 | 
                                    
                                    25.1%
                                 | |
| Sysmiss | 0 |