| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 2006 | 10 |
3.8%
|
|
| 2007 | 28 |
10.8%
|
|
| 2008 | 52 |
20%
|
|
| 2009 | 77 |
29.6%
|
|
| 2010 | 93 |
35.8%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 14784 |