| Value | Category | Cases | |
|---|---|---|---|
| 97 | Refused | 0 |
0%
|
| 98 | Don't know | 0 |
0%
|
| 99 | Missing | 3 |
3.4%
|
| 1988 | 1 |
1.1%
|
|
| 1990 | 1 |
1.1%
|
|
| 1993 | 2 |
2.3%
|
|
| 1995 | 2 |
2.3%
|
|
| 1998 | 1 |
1.1%
|
|
| 1999 | 2 |
2.3%
|
|
| 2000 | 8 |
9.1%
|
|
| 2001 | 2 |
2.3%
|
|
| 2002 | 4 |
4.5%
|
|
| 2003 | 5 |
5.7%
|
|
| 2004 | 1 |
1.1%
|
|
| 2005 | 7 |
8%
|
|
| 2006 | 4 |
4.5%
|
|
| 2007 | 1 |
1.1%
|
|
| 2008 | 9 |
10.2%
|
|
| 2009 | 10 |
11.4%
|
|
| 2010 | 7 |
8%
|
|
| 2011 | 10 |
11.4%
|
|
| 2012 | 6 |
6.8%
|
|
| 2013 | 2 |
2.3%
|
|
| Sysmiss | 1637 |