| Value | Category | Cases | |
|---|---|---|---|
| 99 | Missing | 1 |
3.3%
|
| 1999 | 1 |
3.3%
|
|
| 2000 | 2 |
6.7%
|
|
| 2001 | 1 |
3.3%
|
|
| 2003 | 1 |
3.3%
|
|
| 2004 | 1 |
3.3%
|
|
| 2005 | 1 |
3.3%
|
|
| 2007 | 1 |
3.3%
|
|
| 2008 | 2 |
6.7%
|
|
| 2009 | 6 |
20%
|
|
| 2010 | 3 |
10%
|
|
| 2011 | 1 |
3.3%
|
|
| 2012 | 9 |
30%
|
|
| Sysmiss | 1695 |