| Value | Category | Cases | |
|---|---|---|---|
| 1992 | 9 |
1.4%
|
|
| 1993 | 2 |
0.3%
|
|
| 1994 | 4 |
0.6%
|
|
| 1995 | 2 |
0.3%
|
|
| 1996 | 1 |
0.2%
|
|
| 1997 | 4 |
0.6%
|
|
| 1998 | 2 |
0.3%
|
|
| 1999 | 2 |
0.3%
|
|
| 2000 | 2 |
0.3%
|
|
| 2002 | 2 |
0.3%
|
|
| 2003 | 1 |
0.2%
|
|
| 2004 | 1 |
0.2%
|
|
| 2005 | 1 |
0.2%
|
|
| 2017 | 279 |
43%
|
|
| 2018 | 2 |
0.3%
|
|
| Missing value | 335 |
51.6%
|