| Value | Category | Cases | |
|---|---|---|---|
| Duration is not specified | 374 |
7.1%
|
|
| Less than a year | 76 |
1.4%
|
|
| 1 | 49 |
0.9%
|
|
| 2 | 32 |
0.6%
|
|
| 3 | 40 |
0.8%
|
|
| 4 | 16 |
0.3%
|
|
| 5 | 103 |
2%
|
|
| 6 | 15 |
0.3%
|
|
| 7 | 1 |
0%
|
|
| 8 | 2 |
0%
|
|
| 9 | 2 |
0%
|
|
| 10 | 68 |
1.3%
|
|
| 12 | 5 |
0.1%
|
|
| 15 | 4 |
0.1%
|
|
| 20 | 19 |
0.4%
|
|
| 25 | 3 |
0.1%
|
|
| 30 | 2 |
0%
|
|
| 40 | 1 |
0%
|
|
| 50 | 12 |
0.2%
|
|
| 51 | 2 |
0%
|
|
| 100 | 3 |
0.1%
|
|
| 1999 | 1 |
0%
|
|
| Missing value | 4414 |
84.2%
|