| Value | Category | Cases | |
|---|---|---|---|
| 0 | 466 |
97.5%
|
|
| 2003 | 1 |
0.2%
|
|
| 2008 | 2 |
0.4%
|
|
| 2009 | 3 |
0.6%
|
|
| 2010 | 6 |
1.3%
|
|
| Sysmiss | 2 |