Value |
Category |
-9 |
Don't know (spontaneous) |
1968 |
|
2001 |
|
2002 |
|
2007 |
|
2008 |
|
2009 |
|
2010 |
|
2011 |
|
2014 |
|
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.