| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 1 |
3%
|
|
| 2003 | 1 |
3%
|
|
| 2005 | 1 |
3%
|
|
| 2007 | 1 |
3%
|
|
| 2008 | 1 |
3%
|
|
| 2009 | 5 |
15.2%
|
|
| 2011 | 1 |
3%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9999 | Missing | 22 |
66.7%
|
| Sysmiss | 1424 |