| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1 |
0.5%
|
|
| 1989 | 2 |
1%
|
|
| 1990 | 3 |
1.6%
|
|
| 1991 | 1 |
0.5%
|
|
| 1996 | 1 |
0.5%
|
|
| 1998 | 2 |
1%
|
|
| 1999 | 1 |
0.5%
|
|
| 2000 | 2 |
1%
|
|
| 2001 | 6 |
3.1%
|
|
| 2002 | 3 |
1.6%
|
|
| 2003 | 5 |
2.6%
|
|
| 2004 | 5 |
2.6%
|
|
| 2005 | 5 |
2.6%
|
|
| 2006 | 6 |
3.1%
|
|
| 2007 | 7 |
3.6%
|
|
| 2008 | 5 |
2.6%
|
|
| 2009 | 9 |
4.7%
|
|
| 2010 | 9 |
4.7%
|
|
| 2011 | 14 |
7.3%
|
|
| 2012 | 50 |
26%
|
|
| 2013 | 39 |
20.3%
|
|
| 9997 | DO NOT KNOW | 16 |
8.3%
|
| 9999 | missing | 0 |
0%
|
| Sysmiss | 2304 |