| Value |
Category |
Cases |
|
| 2009 |
|
2 |
|
| 2011 |
|
4 |
|
| 2012 |
|
5 |
|
| 2013 |
|
11 |
|
| 9888 |
don’t know year |
0 |
|
| 9998 |
|
5 |
|
| 9999 |
never travel year |
14 |
|
| Sysmiss |
|
10875 |
|
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.
