| Value | Category | Cases | |
|---|---|---|---|
| 2013 | 206 | 
                                                                 
                                    
                                    40.7%
                                 
                                                             | 
                                                        
                    |
| 2014 | 128 | 
                                                                 
                                    
                                    25.3%
                                 
                                                             | 
                                                        
                    |
| 2015 | 100 | 
                                                                 
                                    
                                    19.8%
                                 
                                                             | 
                                                        
                    |
| 2016 | 37 | 
                                                                 
                                    
                                    7.3%
                                 
                                                             | 
                                                        
                    |
| 2017 | 13 | 
                                                                 
                                    
                                    2.6%
                                 
                                                             | 
                                                        
                    |
| 2018 | 2 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| Missing value | 20 | 
                                                                 
                                    
                                    4%
                                 
                                                             |