| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 1 |
0.1%
|
|
| 1992 | 5 |
0.4%
|
|
| 1994 | 2 |
0.1%
|
|
| 1997 | 1 |
0.1%
|
|
| 2012 | 761 |
55.4%
|
|
| 2013 | 230 |
16.8%
|
|
| 2014 | 22 |
1.6%
|
|
| 2015 | 59 |
4.3%
|
|
| 2016 | 31 |
2.3%
|
|
| 2017 | 69 |
5%
|
|
| Missing value | 192 |
14%
|