| Value |
Category |
| 1 |
Before 1984 |
| 2 |
1985-1989 |
| 3 |
1990-1994 |
| 4 |
1995-1999 |
| 5 |
2000-2004 |
| 6 |
2009-2009 |
| 7 |
2010 to 2012 |
| 8 |
Not specifies |
| Sysmiss |
|
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.