| Value | Category | Cases | |
|---|---|---|---|
| 1989 | 1 |
0.1%
|
|
| 1990 | 1 |
0.1%
|
|
| 1993 | 1 |
0.1%
|
|
| 1996 | 2 |
0.1%
|
|
| 1997 | 1 |
0.1%
|
|
| 1998 | 2 |
0.1%
|
|
| 1999 | 1 |
0.1%
|
|
| 2000 | 2 |
0.1%
|
|
| 2002 | 2 |
0.1%
|
|
| 2003 | 6 |
0.4%
|
|
| 2004 | 4 |
0.3%
|
|
| 2005 | 11 |
0.7%
|
|
| 2006 | 12 |
0.8%
|
|
| 2007 | 10 |
0.7%
|
|
| 2008 | 17 |
1.1%
|
|
| 2009 | 14 |
0.9%
|
|
| 2010 | 61 |
4%
|
|
| 2011 | 485 |
31.6%
|
|
| 2012 | 647 |
42.1%
|
|
| 9998 | don't know | 83 |
5.4%
|
| 9999 | don't search | 172 |
11.2%
|
| Sysmiss | 47651 |