| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 2007 | 4 |
0.4%
|
|
| 2008 | 47 |
5%
|
|
| 2009 | 103 |
10.9%
|
|
| 2010 | 222 |
23.4%
|
|
| 2011 | 303 |
31.9%
|
|
| 2012 | 270 |
28.5%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 3533 |