| Value |
Category |
| 1 |
JANUARY-MARCH 2010 |
| 2 |
APRIL-JUNE 2010 |
| 3 |
JULY-SEPTEMBER 2010 |
| 4 |
OCTOBER-DECEMBER 2010 |
| 5 |
JANUARY-MARCH 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.