| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 0 |
0%
|
| -7 | Never registered | 0 |
0%
|
| 1989 | 1 |
25%
|
|
| 2001 | 1 |
25%
|
|
| 2003 | 1 |
25%
|
|
| 2010 | 1 |
25%
|