| Value | Category | Cases | |
|---|---|---|---|
| 1968 | 1 |
4.5%
|
|
| 1970 | 1 |
4.5%
|
|
| 1981 | 1 |
4.5%
|
|
| 1988 | 1 |
4.5%
|
|
| 1992 | 1 |
4.5%
|
|
| 1993 | 1 |
4.5%
|
|
| 1998 | 1 |
4.5%
|
|
| 1999 | 1 |
4.5%
|
|
| 2002 | 1 |
4.5%
|
|
| 2005 | 1 |
4.5%
|
|
| 2007 | 1 |
4.5%
|
|
| 2009 | 1 |
4.5%
|
|
| 2011 | 1 |
4.5%
|
|
| 2017 | 2 |
9.1%
|
|
| 2019 | 3 |
13.6%
|
|
| 2021 | 1 |
4.5%
|
|
| 2022 | 1 |
4.5%
|
|
| 2023 | 2 |
9.1%
|
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 41990 |