| Value | Category | Cases | |
|---|---|---|---|
| 1978 | 1 | 
                                    
                                    2.7%
                                 | |
| 1996 | 2 | 
                                    
                                    5.4%
                                 | |
| 1999 | 1 | 
                                    
                                    2.7%
                                 | |
| 2000 | 4 | 
                                    
                                    10.8%
                                 | |
| 2003 | 2 | 
                                    
                                    5.4%
                                 | |
| 2005 | 1 | 
                                    
                                    2.7%
                                 | |
| 2006 | 2 | 
                                    
                                    5.4%
                                 | |
| 2007 | 1 | 
                                    
                                    2.7%
                                 | |
| 2008 | 1 | 
                                    
                                    2.7%
                                 | |
| 2010 | 1 | 
                                    
                                    2.7%
                                 | |
| 2012 | 1 | 
                                    
                                    2.7%
                                 | |
| 2013 | 3 | 
                                    
                                    8.1%
                                 | |
| 2015 | 7 | 
                                    
                                    18.9%
                                 | |
| 2016 | 2 | 
                                    
                                    5.4%
                                 | |
| 2017 | 1 | 
                                    
                                    2.7%
                                 | |
| 2018 | 1 | 
                                    
                                    2.7%
                                 | |
| 2019 | 2 | 
                                    
                                    5.4%
                                 | |
| 2020 | 3 | 
                                    
                                    8.1%
                                 | |
| 2021 | 1 | 
                                    
                                    2.7%
                                 |