Explanation of the coverage map colors
| < 1 year ago | |
| 1 – 2 years | |
| 2 – 3 years | |
| 3 – 4 years | |
| 4 – 5 years | |
| 5 – 6 years | |
| > 6 years ago |
Explanation of the coverage map colors
| < 1 year ago | |
| 1 – 2 years | |
| 2 – 3 years | |
| 3 – 4 years | |
| 4 – 5 years | |
| 5 – 6 years | |
| > 6 years ago |