| value | category | cases | |
|---|---|---|---|
| 1 | Always available (no interruptions) | 343 |
49.6%
|
| 2 | Often available (some interruptions of less than 2 hours per | 195 |
28.2%
|
| 3 | Sometimes available (frequent or prolonged interruptions of | 153 |
22.1%
|
| 9 | 75 |