| Value |
Category |
| -9 |
Don't know (spontaneous) |
| 1972 |
|
| 2000 |
|
| 2002 |
|
| 2004 |
|
| 2005 |
|
| 2006 |
|
| 2007 |
|
| 2008 |
|
| 2009 |
|
| 2011 |
|
| 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.
