| Value | Category | Cases | |
|---|---|---|---|
| 999 | 1 |
1.8%
|
|
| 1996 | 2 |
3.6%
|
|
| 1999 | 3 |
5.5%
|
|
| 2000 | 28 |
50.9%
|
|
| 2001 | 7 |
12.7%
|
|
| 2002 | 1 |
1.8%
|
|
| 2006 | 8 |
14.5%
|
|
| 2007 | 1 |
1.8%
|
|
| 2008 | 1 |
1.8%
|
|
| 2013 | 2 |
3.6%
|
|
| 9998 | 1 |
1.8%
|
|
| Sysmiss | 170 |