| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 23476 |
38.2%
|
| 1 | A few months | 2886 |
4.7%
|
| 2 | One year | 16038 |
26.1%
|
| 3 | Two years | 11127 |
18.1%
|
| 4 | Three years or more | 7869 |
12.8%
|