| Value | Category | Cases | |
|---|---|---|---|
| 1976 | 1 |
5.3%
|
|
| 1984 | 1 |
5.3%
|
|
| 1995 | 1 |
5.3%
|
|
| 1998 | 2 |
10.5%
|
|
| 2000 | 1 |
5.3%
|
|
| 2005 | 2 |
10.5%
|
|
| 2007 | 1 |
5.3%
|
|
| 2008 | 1 |
5.3%
|
|
| 2012 | 1 |
5.3%
|
|
| 2013 | 3 |
15.8%
|
|
| 9998 | don't know | 5 |
26.3%
|
| Sysmiss | 44595 |