| Value | Category | Cases | |
|---|---|---|---|
| 0 | Less than one year at level | 10 |
7.5%
|
| 1 | 6 |
4.5%
|
|
| 2 | 14 |
10.5%
|
|
| 3 | 27 |
20.3%
|
|
| 4 | 68 |
51.1%
|
|
| 5 | 4 |
3%
|
|
| 6 | 1 |
0.8%
|
|
| 7 | 1 |
0.8%
|
|
| 8 | 1 |
0.8%
|
|
| 9 | 1 |
0.8%
|