| Period of residence | Frequency | Percent |
| 0 - 4 months | 34 | 4.2 |
| 4 - 8 months | 36 | 4.5 |
| 8 - 12 months | 63 | 7.9 |
| 1 to 2 years | 68 | 8.5 |
| > 2 years | 600 | 74.9 |
| Total | 801 | 100 |