| Value | Category | Cases | |
|---|---|---|---|
| 1977 | 1 |
0.3%
|
|
| 1996 | 1 |
0.3%
|
|
| 2012 | 1 |
0.3%
|
|
| 2016 | 1 |
0.3%
|
|
| 2017 | 2 |
0.6%
|
|
| 2022 | 1 |
0.3%
|
|
| 2023 | 2 |
0.6%
|
|
| Missing value | 309 |
97.2%
|