| Value | Category | Cases | |
|---|---|---|---|
| 1988 | 1 |
1.6%
|
|
| 1992 | 1 |
1.6%
|
|
| 1994 | 1 |
1.6%
|
|
| 1996 | 1 |
1.6%
|
|
| 1998 | 2 |
3.2%
|
|
| 1999 | 1 |
1.6%
|
|
| 2000 | 1 |
1.6%
|
|
| 2002 | 2 |
3.2%
|
|
| 2004 | 3 |
4.8%
|
|
| 2006 | 2 |
3.2%
|
|
| 2008 | 2 |
3.2%
|
|
| 2009 | 4 |
6.3%
|
|
| 2010 | 6 |
9.5%
|
|
| 2011 | 6 |
9.5%
|
|
| 2012 | 7 |
11.1%
|
|
| 2013 | 21 |
33.3%
|
|
| 2014 | 2 |
3.2%
|
|
| Sysmiss | .don't know | 0 | |
| Sysmiss | .qre refused | 0 | |
| Sysmiss | .refusal | 0 | |
| Sysmiss | .skip | 0 | |
| Sysmiss | .x. censored | 0 | |
| Sysmiss | 1371 |