| Value | Category | Cases | |
|---|---|---|---|
| 0 | Preprinted 'X' | 4129 |
16%
|
| 1 | 2003 | 153 |
0.6%
|
| 2 | 2002 | 102 |
0.4%
|
| 3 | 2001 | 47 |
0.2%
|
| 4 | 2000 | 27 |
0.1%
|
| 5 | Before 2000 | 68 |
0.3%
|
| 6 | Not vaccinated | 21227 |
82.4%
|
| Sysmiss | 10358 |