| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2011-2012 | 408 |
24.5%
|
| 2 | 2008-2010 | 690 |
41.5%
|
| 3 | 2001-2007 | 403 |
24.2%
|
| 4 | 2000-2006 | 57 |
3.4%
|
| 5 | 1999 and before | 97 |
5.8%
|
| 9 | Missing values | 9 |
0.5%
|