| Value | Category | 
|---|---|
| 1 | no changes | 
| 2 | new member | 
| 3 | died | 
| 4 | Gone temporarily to other country | 
| 5 | Gone temporarily within the country | 
| 6 | Gone permanently to other country | 
| 7 | Gone permanently within the country | 
| 8 | Returned from other country | 
| 9 | Returned within the country | 
| Sysmiss |