| Value | Category | Cases | |
|---|---|---|---|
| 1950 | 1 |
5.9%
|
|
| 1967 | 1 |
5.9%
|
|
| 1976 | 1 |
5.9%
|
|
| 1990 | 1 |
5.9%
|
|
| 2000 | 1 |
5.9%
|
|
| 2005 | 1 |
5.9%
|
|
| 2007 | 1 |
5.9%
|
|
| 2008 | 1 |
5.9%
|
|
| 2012 | 1 |
5.9%
|
|
| 2015 | 2 |
11.8%
|
|
| 2018 | 1 |
5.9%
|
|
| 2021 | 1 |
5.9%
|
|
| 9998 | Don't know | 4 |
23.5%
|
| Sysmiss | 41995 |