| Value | Category | Cases | |
|---|---|---|---|
| 1983 | 2 |
2.3%
|
|
| 1985 | 1 |
1.1%
|
|
| 1986 | 1 |
1.1%
|
|
| 1988 | 2 |
2.3%
|
|
| 1989 | 2 |
2.3%
|
|
| 1991 | 2 |
2.3%
|
|
| 1992 | 2 |
2.3%
|
|
| 1993 | 1 |
1.1%
|
|
| 1995 | 1 |
1.1%
|
|
| 1996 | 1 |
1.1%
|
|
| 1998 | 4 |
4.5%
|
|
| 1999 | 4 |
4.5%
|
|
| 2001 | 2 |
2.3%
|
|
| 2002 | 5 |
5.7%
|
|
| 2003 | 2 |
2.3%
|
|
| 2004 | 2 |
2.3%
|
|
| 2005 | 2 |
2.3%
|
|
| 2006 | 4 |
4.5%
|
|
| 2007 | 2 |
2.3%
|
|
| 2008 | 2 |
2.3%
|
|
| 2009 | 4 |
4.5%
|
|
| 2010 | 4 |
4.5%
|
|
| 2011 | 4 |
4.5%
|
|
| 2012 | 4 |
4.5%
|
|
| 2013 | 4 |
4.5%
|
|
| 2014 | 10 |
11.4%
|
|
| 2015 | 10 |
11.4%
|
|
| 9998 | don't know | 4 |
4.5%
|
| Sysmiss | 35695 |