| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1982 | 1 |
2.3%
|
|
| 1983 | 1 |
2.3%
|
|
| 1985 | 1 |
2.3%
|
|
| 1986 | 1 |
2.3%
|
|
| 1992 | 1 |
2.3%
|
|
| 1993 | 1 |
2.3%
|
|
| 1998 | 1 |
2.3%
|
|
| 1999 | 1 |
2.3%
|
|
| 2000 | 1 |
2.3%
|
|
| 2001 | 2 |
4.7%
|
|
| 2002 | 2 |
4.7%
|
|
| 2004 | 2 |
4.7%
|
|
| 2005 | 5 |
11.6%
|
|
| 2006 | 2 |
4.7%
|
|
| 2007 | 1 |
2.3%
|
|
| 2008 | 2 |
4.7%
|
|
| 2009 | 4 |
9.3%
|
|
| 2010 | 1 |
2.3%
|
|
| 2013 | 1 |
2.3%
|
|
| 2014 | 1 |
2.3%
|
|
| 2015 | 4 |
9.3%
|
|
| 2016 | 2 |
4.7%
|
|
| 2018 | 2 |
4.7%
|
|
| 2019 | 1 |
2.3%
|
|
| 2022 | 1 |
2.3%
|
|
| 2023 | 1 |
2.3%
|
|
| Sysmiss | 112 |