| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 2 |
0.6%
|
|
| 1998 | 2 |
0.6%
|
|
| 1999 | 4 |
1.2%
|
|
| 2000 | 9 |
2.8%
|
|
| 2001 | 21 |
6.5%
|
|
| 2002 | 38 |
11.7%
|
|
| 2003 | 66 |
20.3%
|
|
| 2004 | 106 |
32.6%
|
|
| 2005 | 76 |
23.4%
|
|
| 9999 | 9999. Don't know | 1 |
0.3%
|
| Sysmiss | 674 |