Elizabeth Thatcher, a young school teacher from a wealthy Eastern family, migrates from the big city to teach school in a small coal mining town in the west.
| 8.2 |
| 8.3 |
| 8.4 |
| 8.3 |
| 8.5 |
| 8.4 |
| 8.5 |
| 8.4 |
| 8.5 |
| 8.6 |
| Season 2 | 8.5 | 8.3 | 8.3 | 8.3 | 8.5 | 8.3 | 8.5 | 8.2 | 8.6 |
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| Season 3 | 8.5 | 8.5 | 8.5 | 8.5 | 8.6 | 8.4 | 8.6 | 8.4 | 8.8 |
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| Season 4 | 8.5 | 8.6 | 8.4 | 8.5 | 8.5 | 8.5 | 8.8 | 8.3 | 8.5 | 8.4 | 8.7 |
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| Season 5 | 8.3 | 8.2 | 8.5 | 8.3 | 8.8 | 8.4 | 8.2 | 8.3 | 8.2 | 8.5 |
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| Season 6 | 8.1 | 8.0 | 7.9 | 8.1 | 7.9 | 7.8 | 7.8 | 7.9 | 8.2 |
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| Season 7 | 7.9 | 7.8 | 7.9 | 8.0 | 8.1 | 8.2 | 7.7 | 8.2 | 8.0 | 8.4 |
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| Season 8 | 7.3 | 7.2 | 7.2 | 7.2 | 7.1 | 7.2 | 7.1 | 7.1 | 6.7 | 7.0 | 6.9 | 6.2 |
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| Season 9 | 6.8 | 6.7 | 6.7 | 6.9 | 7.1 | 6.9 | 7.2 | 7.3 | 7.0 | 7.2 | 7.2 | 7.2 |
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| Season 10 | 7.7 | 7.5 | 7.6 | 7.9 | 7.5 | 7.6 | 7.7 | 7.8 | 7.5 | 8.0 | 7.0 | 7.0 |
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| Season 11 | 7.5 | 7.4 | 7.6 | 7.5 | 7.7 | 8.1 | 7.7 | 8.0 | 8.0 | 8.2 | 8.4 | 8.5 |
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| Season 12 | 8.1 | 7.8 | 8.0 | 8.1 | 8.3 | 8.0 | 8.0 | 7.7 | 7.7 | 8.2 | 8.6 | 8.5 |
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| Season 13 | 8.1 | 8.2 | 7.7 | 7.7 | 7.4 | 7.7 | 7.2 | 6.4 | 7.5 | 8.1 | 6.8 | 8.1 |
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