| Value | Category | Cases | |
|---|---|---|---|
| 0 | 7614 |
98.4%
|
|
| 2002 | 5 |
0.1%
|
|
| 2003 | 4 |
0.1%
|
|
| 2004 | 10 |
0.1%
|
|
| 2005 | 20 |
0.3%
|
|
| 2006 | 53 |
0.7%
|
|
| 2007 | 10 |
0.1%
|
|
| 4444 | 6 |
0.1%
|
|
| 6666 | 16 |
0.2%
|
|
| 9997 | 3 |
0%
|
|
| Sysmiss | 1054 |