| Value | Category | Cases | |
|---|---|---|---|
| 1983 | 1 |
2.4%
|
|
| 1985 | 2 |
4.9%
|
|
| 1990 | 2 |
4.9%
|
|
| 1992 | 1 |
2.4%
|
|
| 1997 | 1 |
2.4%
|
|
| 1998 | 1 |
2.4%
|
|
| 1999 | 1 |
2.4%
|
|
| 2001 | 1 |
2.4%
|
|
| 2004 | 1 |
2.4%
|
|
| 2007 | 1 |
2.4%
|
|
| 2008 | 4 |
9.8%
|
|
| 2009 | 4 |
9.8%
|
|
| 2010 | 1 |
2.4%
|
|
| 2011 | 3 |
7.3%
|
|
| 2012 | 11 |
26.8%
|
|
| 2013 | 3 |
7.3%
|
|
| 9997 | DO NOT KNOW | 3 |
7.3%
|
| 9999 | missing | 0 |
0%
|
| Sysmiss | 2455 |