| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 2008 | 20 |
2.6%
|
|
| 2009 | 76 |
10%
|
|
| 2010 | 121 |
15.9%
|
|
| 2011 | 231 |
30.3%
|
|
| 2012 | 314 |
41.2%
|
|
| 9997 | Inconsistent | 1 |
0.1%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 4566 |