| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 86 |
68.8%
|
| 1990 | 1 |
0.8%
|
|
| 1994 | 1 |
0.8%
|
|
| 1995 | 3 |
2.4%
|
|
| 1996 | 1 |
0.8%
|
|
| 1998 | 1 |
0.8%
|
|
| 1999 | 9 |
7.2%
|
|
| 2001 | 1 |
0.8%
|
|
| 2003 | 5 |
4%
|
|
| 2004 | 4 |
3.2%
|
|
| 2005 | 5 |
4%
|
|
| 2006 | 2 |
1.6%
|
|
| 2007 | 2 |
1.6%
|
|
| 2008 | 3 |
2.4%
|
|
| 2009 | 1 |
0.8%
|
|
| Sysmiss | 61 |