| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 1 |
3.2%
|
|
| 1996 | 3 |
9.7%
|
|
| 1997 | 2 |
6.5%
|
|
| 1998 | 1 |
3.2%
|
|
| 1999 | 1 |
3.2%
|
|
| 2001 | 3 |
9.7%
|
|
| 2002 | 4 |
12.9%
|
|
| 2003 | 5 |
16.1%
|
|
| 2005 | 4 |
12.9%
|
|
| 2006 | 4 |
12.9%
|
|
| 2007 | 3 |
9.7%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 10339 |