| Value | Category | Cases | |
|---|---|---|---|
| -99 | Refused | 0 |
0%
|
| -98 | Don't Know | 1 |
0.1%
|
| -97 | Not Applicable | 0 |
0%
|
| 1995 | 1 |
0.1%
|
|
| 1996 | 1 |
0.1%
|
|
| 1997 | 1 |
0.1%
|
|
| 1998 | 1 |
0.1%
|
|
| 1999 | 1 |
0.1%
|
|
| 2000 | 4 |
0.6%
|
|
| 2001 | 3 |
0.4%
|
|
| 2002 | 13 |
1.9%
|
|
| 2003 | 9 |
1.3%
|
|
| 2004 | 13 |
1.9%
|
|
| 2005 | 24 |
3.6%
|
|
| 2006 | 21 |
3.1%
|
|
| 2007 | 30 |
4.5%
|
|
| 2008 | 34 |
5.1%
|
|
| 2009 | 64 |
9.5%
|
|
| 2010 | 100 |
14.9%
|
|
| 2011 | 125 |
18.6%
|
|
| 2012 | 146 |
21.7%
|
|
| 2013 | 81 |
12%
|
|
| Sysmiss | 215 |