| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 1 |
0%
|
| 2 | 1 | 3 |
0.1%
|
| 3 | 2 | 3 |
0.1%
|
| 4 | 3 | 2 |
0%
|
| 5 | 4 | 1 |
0%
|
| 6 | 5 | 1 |
0%
|
| 7 | 8 | 1 |
0%
|
| 8 | 20 | 2 |
0%
|
| Missing value | 4055 |
99.7%
|