| Year | Number of Cases |
|---|---|
| 2000 | 1 |
| 2001 | 2 |
| 2002 | 1 |
| 2003 | 7 |
| 2004 | 2 |
| 2008 | 3 |
| 2009 | 1 |
| 2010 | 1 |
| 2011 | 12 |
| 2012 | 10 |
| 2013 | 20 |
| 2014 | 12 |
| 2015 | 21 |
| 2016 | 8 |
| Year | Number of Cases |
|---|---|
| 2000 | 1 |
| 2001 | 2 |
| 2002 | 1 |
| 2003 | 7 |
| 2004 | 2 |
| 2008 | 3 |
| 2009 | 1 |
| 2010 | 1 |
| 2011 | 12 |
| 2012 | 10 |
| 2013 | 20 |
| 2014 | 12 |
| 2015 | 21 |
| 2016 | 8 |