| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 1 |
0.5%
|
|
| 2012 | 2 |
1.1%
|
|
| 2015 | 1 |
0.5%
|
|
| 2016 | 10 |
5.3%
|
|
| 2017 | 13 |
6.9%
|
|
| 2018 | 153 |
81%
|
|
| Missing value | 9 |
4.8%
|