| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.3%
|
| 2008 | 1 |
0.7%
|
|
| 2015 | 2 |
1.3%
|
|
| 2016 | 2 |
1.3%
|
|
| 2017 | 11 |
7.3%
|
|
| 2018 | 3 |
2%
|
|
| NA | 130 |
86.1%
|