| Value | Category | Cases | |
|---|---|---|---|
| 1965 | 1 |
2%
|
|
| 1998 | 1 |
2%
|
|
| 1999 | 2 |
4.1%
|
|
| 2000 | 1 |
2%
|
|
| 2001 | 1 |
2%
|
|
| 2002 | 1 |
2%
|
|
| 2003 | 1 |
2%
|
|
| 2004 | 4 |
8.2%
|
|
| 2005 | 15 |
30.6%
|
|
| 2006 | 20 |
40.8%
|
|
| 2007 | 1 |
2%
|
|
| 9999 | 9999. Don't know | 1 |
2%
|
| Sysmiss | 950 |