| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
0.1%
|
|
| 2001 | 1 |
0.1%
|
|
| 2002 | 1 |
0.1%
|
|
| 2003 | 2 |
0.3%
|
|
| 2004 | 2 |
0.3%
|
|
| 2005 | 2 |
0.3%
|
|
| 2006 | 72 |
10%
|
|
| 2007 | 103 |
14.3%
|
|
| 2008 | 186 |
25.9%
|
|
| 2009 | 348 |
48.5%
|
|
| Sysmiss | 9351 |