| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 5 |
6.4%
|
|
| 1991 | 14 |
17.9%
|
|
| 1992 | 2 |
2.6%
|
|
| 1993 | 1 |
1.3%
|
|
| 1998 | 1 |
1.3%
|
|
| 2000 | 6 |
7.7%
|
|
| 2001 | 1 |
1.3%
|
|
| 2005 | 2 |
2.6%
|
|
| 2008 | 1 |
1.3%
|
|
| 2009 | 1 |
1.3%
|
|
| 2010 | 13 |
16.7%
|
|
| 2012 | 2 |
2.6%
|
|
| 2015 | 1 |
1.3%
|
|
| 2016 | 13 |
16.7%
|
|
| 2017 | 2 |
2.6%
|
|
| 2018 | 3 |
3.8%
|
|
| 2019 | 3 |
3.8%
|
|
| 2021 | 1 |
1.3%
|
|
| Missing value | 6 |
7.7%
|