| 2016 | Withheld (Agency reported 6 of 12 months) | Benchmark unavailable | 22.9 (126 reporting, sample year) |
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| 2017 | Withheld (Agency reported 11 of 12 months) | Benchmark unavailable | 21.6 (129 reporting, sample year) |
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| 2018 | Withheld (Agency reported 3 of 12 months) | Benchmark unavailable | 20.2 (126 reporting, sample year) |
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| 2019 | 11.9 | 12.1 | 18.3 (130 reporting, sample year) |
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| 2020 | 28.6 | 21.0 | 19.5 (140 reporting, sample year) |
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| 2021 | 29.4 | Benchmark unavailable | 20.9 (133 reporting, sample year) |
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| 2022 | 31.8 | Benchmark unavailable | 20.6 (121 reporting, sample year) |
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| 2023 | 16.1 | 10.2 | 19.6 (122 reporting, sample year) |
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| 2024 | 14.2 | 14.2 | 15.9 (135 reporting, sample year) |
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| 2025 | 15.4 | 7.3 | 13.6 (139 reporting, sample year) |
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