| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | <12 months | 500 |
16.3%
|
| 1 | 1 year | 213 |
7%
|
| 2 | 2 years | 705 |
23%
|
| 3 | 3 years | 619 |
20.2%
|
| 4 | 4 years | 299 |
9.8%
|
| 5 | 5 years | 149 |
4.9%
|
| 6 | 6+ years | 119 |
3.9%
|
| 7 | Non-numeric | 326 |
10.6%
|
| 8 | Don't know | 134 |
4.4%
|