| Value |
Category |
| 1 |
Before September 2012 |
| 2 |
October 2012 |
| 3 |
November 2012 |
| 4 |
December 2012 |
| 5 |
January 2013 |
| 6 |
February 2013 |
| 7 |
March 2013 |
| 8 |
April 2013 |
| 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.