| Value | Category | Cases | |
|---|---|---|---|
| 1967 | 1 |
0.4%
|
|
| 1975 | 1 |
0.4%
|
|
| 1987 | 1 |
0.4%
|
|
| 1989 | 1 |
0.4%
|
|
| 1990 | 8 |
2.8%
|
|
| 1991 | 1 |
0.4%
|
|
| 1992 | 3 |
1.1%
|
|
| 1993 | 5 |
1.8%
|
|
| 1994 | 9 |
3.2%
|
|
| 1995 | 7 |
2.5%
|
|
| 1996 | 5 |
1.8%
|
|
| 1997 | 3 |
1.1%
|
|
| 1998 | 7 |
2.5%
|
|
| 1999 | 1 |
0.4%
|
|
| 2000 | 18 |
6.4%
|
|
| 2001 | 7 |
2.5%
|
|
| 2002 | 14 |
5%
|
|
| 2003 | 5 |
1.8%
|
|
| 2004 | 16 |
5.7%
|
|
| 2005 | 9 |
3.2%
|
|
| 2006 | 14 |
5%
|
|
| 2007 | 9 |
3.2%
|
|
| 2008 | 14 |
5%
|
|
| 2009 | 24 |
8.5%
|
|
| 2010 | 27 |
9.6%
|
|
| 2011 | 18 |
6.4%
|
|
| 2012 | 21 |
7.4%
|
|
| 2013 | 25 |
8.9%
|
|
| 2014 | 8 |
2.8%
|
|
| Sysmiss | .don't know | 0 | |
| Sysmiss | .qre refused | 0 | |
| Sysmiss | .refusal | 0 | |
| Sysmiss | .skip | 0 | |
| Sysmiss | .x. censored | 0 | |
| Sysmiss | 1152 |