| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 591 |
13.2%
|
| 2 | a quarter of a year ago | 1574 |
35.2%
|
| 3 | half of a year ago | 543 |
12.1%
|
| 4 | three quarters of a year ago | 301 |
6.7%
|
| 5 | a year ago | 960 |
21.5%
|
| 6 | more than a year ago | 504 |
11.3%
|
| Sysmiss | 121 |