| Value | Category | Cases | |
|---|---|---|---|
| 0 | 290 |
80.6%
|
|
| 2 | 1 |
0.3%
|
|
| 3 | 1 |
0.3%
|
|
| 1998 | 1 |
0.3%
|
|
| 2003 | 2 |
0.6%
|
|
| 2010 | 4 |
1.1%
|
|
| 2011 | 10 |
2.8%
|
|
| 2012 | 23 |
6.4%
|
|
| 8888 | 28 |
7.8%
|
|
| Sysmiss | 1334 |