| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2003 | 40 |
0.6%
|
| 2 | 2002 | 51 |
0.7%
|
| 3 | 2001 | 10 |
0.1%
|
| 4 | 2000 | 9 |
0.1%
|
| 5 | Before 2000 | 27 |
0.4%
|
| 6 | Not vaccinated | 6826 |
98%
|
| Sysmiss | 5963 |