| Value | Category | Cases | |
|---|---|---|---|
| 0 | 458 |
95.8%
|
|
| 2001 | 1 |
0.2%
|
|
| 2005 | 1 |
0.2%
|
|
| 2006 | 1 |
0.2%
|
|
| 2007 | 2 |
0.4%
|
|
| 2008 | 1 |
0.2%
|
|
| 2009 | 7 |
1.5%
|
|
| 2010 | 7 |
1.5%
|
|
| Sysmiss | 2 |