| Value | Category | Cases | |
|---|---|---|---|
| 2013 | 9 | 
                                    
                                    0.6%
                                 | |
| 2014 | 314 | 
                                    
                                    20.1%
                                 | |
| 2015 | 318 | 
                                    
                                    20.3%
                                 | |
| 2016 | 294 | 
                                    
                                    18.8%
                                 | |
| 2017 | 297 | 
                                    
                                    19%
                                 | |
| 2018 | 264 | 
                                    
                                    16.9%
                                 | |
| 2019 | 9 | 
                                    
                                    0.6%
                                 | |
| 9999 | NO RESPONSE | 1 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 58 | 
                                    
                                    3.7%
                                 |