| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1 |
0.2%
|
|
| 2 | 3 |
0.6%
|
|
| 2001 | 1 |
0.2%
|
|
| 2006 | 49 |
9.6%
|
|
| 2007 | 114 |
22.3%
|
|
| 2008 | 150 |
29.4%
|
|
| 2009 | 136 |
26.6%
|
|
| 2010 | 57 |
11.2%
|
|
| Sysmiss | 667 |