| Value | Category | Cases | |
|---|---|---|---|
| 0 | 401 |
83.9%
|
|
| 2000 | 9 |
1.9%
|
|
| 2001 | 2 |
0.4%
|
|
| 2005 | 1 |
0.2%
|
|
| 2006 | 3 |
0.6%
|
|
| 2007 | 2 |
0.4%
|
|
| 2008 | 29 |
6.1%
|
|
| 2009 | 29 |
6.1%
|
|
| 2010 | 2 |
0.4%
|
|
| Sysmiss | 2 |