| Value | Category | Cases | |
|---|---|---|---|
| 1996 | 1 |
0.6%
|
|
| 1998 | 2 |
1.3%
|
|
| 1999 | 3 |
1.9%
|
|
| 2000 | 6 |
3.8%
|
|
| 2001 | 5 |
3.1%
|
|
| 2002 | 7 |
4.4%
|
|
| 2003 | 5 |
3.1%
|
|
| 2004 | 9 |
5.7%
|
|
| 2005 | 15 |
9.4%
|
|
| 2006 | 17 |
10.7%
|
|
| 2007 | 12 |
7.5%
|
|
| 2008 | 16 |
10.1%
|
|
| 2009 | 12 |
7.5%
|
|
| 2010 | 15 |
9.4%
|
|
| 2011 | 17 |
10.7%
|
|
| 2012 | 16 |
10.1%
|
|
| 9998 | Don't know | 1 |
0.6%
|
| Sysmiss | 1380 |