| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1950 | 1 |
2%
|
|
| 1960 | 1 |
2%
|
|
| 1970 | 1 |
2%
|
|
| 1980 | 1 |
2%
|
|
| 1987 | 1 |
2%
|
|
| 1989 | 2 |
3.9%
|
|
| 1990 | 1 |
2%
|
|
| 1992 | 1 |
2%
|
|
| 2000 | 1 |
2%
|
|
| 2002 | 1 |
2%
|
|
| 2003 | 4 |
7.8%
|
|
| 2004 | 1 |
2%
|
|
| 2005 | 4 |
7.8%
|
|
| 2006 | 3 |
5.9%
|
|
| 2007 | 2 |
3.9%
|
|
| 2008 | 2 |
3.9%
|
|
| 2009 | 2 |
3.9%
|
|
| 2010 | 2 |
3.9%
|
|
| 2011 | 1 |
2%
|
|
| 2012 | 3 |
5.9%
|
|
| 2014 | 2 |
3.9%
|
|
| 2015 | 1 |
2%
|
|
| 2016 | 3 |
5.9%
|
|
| 2017 | 2 |
3.9%
|
|
| 2018 | 2 |
3.9%
|
|
| 2020 | 2 |
3.9%
|
|
| 2021 | 1 |
2%
|
|
| 2022 | 3 |
5.9%
|
|
| Sysmiss | 329 |