| Value | Category | Cases | |
|---|---|---|---|
| 1983 | 1 |
3.2%
|
|
| 1986 | 1 |
3.2%
|
|
| 1991 | 2 |
6.5%
|
|
| 1992 | 1 |
3.2%
|
|
| 1993 | 1 |
3.2%
|
|
| 1998 | 2 |
6.5%
|
|
| 1999 | 3 |
9.7%
|
|
| 2001 | 1 |
3.2%
|
|
| 2002 | 4 |
12.9%
|
|
| 2004 | 1 |
3.2%
|
|
| 2005 | 1 |
3.2%
|
|
| 2006 | 3 |
9.7%
|
|
| 2007 | 1 |
3.2%
|
|
| 2008 | 1 |
3.2%
|
|
| 2009 | 1 |
3.2%
|
|
| 2010 | 2 |
6.5%
|
|
| 2011 | 1 |
3.2%
|
|
| 2012 | 1 |
3.2%
|
|
| 2013 | 1 |
3.2%
|
|
| 2015 | 1 |
3.2%
|
|
| 9998 | don't know | 1 |
3.2%
|
| Sysmiss | 12884 |