| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 1 |
2.3%
|
|
| 1995 | 1 |
2.3%
|
|
| 1998 | 2 |
4.7%
|
|
| 1999 | 1 |
2.3%
|
|
| 2001 | 1 |
2.3%
|
|
| 2002 | 1 |
2.3%
|
|
| 2003 | 2 |
4.7%
|
|
| 2004 | 2 |
4.7%
|
|
| 2005 | 4 |
9.3%
|
|
| 2006 | 5 |
11.6%
|
|
| 2007 | 1 |
2.3%
|
|
| 2008 | 2 |
4.7%
|
|
| 2009 | 5 |
11.6%
|
|
| 2010 | 4 |
9.3%
|
|
| 2011 | 6 |
14%
|
|
| 2012 | 5 |
11.6%
|
|
| 9998 | don't know | 0 |
0%
|
| 9999 | not applicable | 0 |
0%
|
| 9999995 | missing:impute | 0 |
0%
|
| Sysmiss | 6560 |