Value |
Category |
-9 |
Don't know (spontaneous) |
2004 |
|
2005 |
|
2006 |
|
2010 |
|
2011 |
|
2012 |
|
2013 |
|
2015 |
|
2016 |
|
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.