| Answer Choices | N | Percent |
|---|---|---|
| 1-5 years | 200 | 25.0 |
| 6-10 years | 83 | 10.4 |
| 11-15 years | 84 | 10.5 |
| 15-20 years | 126 | 15.7 |
| More than 20 years | 304 | 38.0 |
| Not reported | 3 | 0.4 |
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