| Value | Category | Cases | |
|---|---|---|---|
| 1978 | 1 |
0.6%
|
|
| 1993 | 1 |
0.6%
|
|
| 1994 | 1 |
0.6%
|
|
| 1998 | 5 |
3.2%
|
|
| 1999 | 2 |
1.3%
|
|
| 2000 | 1 |
0.6%
|
|
| 2001 | 3 |
1.9%
|
|
| 2002 | 4 |
2.6%
|
|
| 2003 | 2 |
1.3%
|
|
| 2004 | 2 |
1.3%
|
|
| 2005 | 4 |
2.6%
|
|
| 2006 | 2 |
1.3%
|
|
| 2007 | 5 |
3.2%
|
|
| 2008 | 6 |
3.9%
|
|
| 2009 | 4 |
2.6%
|
|
| 2010 | 12 |
7.8%
|
|
| 2011 | 11 |
7.1%
|
|
| 2012 | 33 |
21.4%
|
|
| 2013 | 11 |
7.1%
|
|
| 9997 | DO NOT KNOW | 19 |
12.3%
|
| 9999 | MISSING | 25 |
16.2%
|
| Sysmiss | 2342 |