| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 3 |
4.5%
|
|
| 1992 | 2 |
3%
|
|
| 1994 | 3 |
4.5%
|
|
| 1995 | 4 |
6%
|
|
| 1996 | 7 |
10.4%
|
|
| 1997 | 3 |
4.5%
|
|
| 1998 | 2 |
3%
|
|
| 1999 | 4 |
6%
|
|
| 2000 | 6 |
9%
|
|
| 2001 | 4 |
6%
|
|
| 2002 | 3 |
4.5%
|
|
| 2003 | 5 |
7.5%
|
|
| 2004 | 2 |
3%
|
|
| 2005 | 5 |
7.5%
|
|
| 2006 | 6 |
9%
|
|
| 2007 | 8 |
11.9%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 10303 |