| Value | Category | Cases | |
|---|---|---|---|
| -999999999 | 5 |
0.8%
|
|
| 0 | 1 |
0.2%
|
|
| 2017 | 589 |
93.6%
|
|
| 2018 | 34 |
5.4%
|
|
| Sysmiss | 2593 |