| 2016 | Withheld (Agency reported 11 of 12 months) | Benchmark unavailable | 22.9 (126 reporting, sample year) |
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| 2017 | 16.9 | 22.3 | 21.6 (129 reporting, sample year) |
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| 2018 | 12.2 | 17.2 | 20.2 (126 reporting, sample year) |
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| 2019 | 15.2 | 10.8 | 18.3 (130 reporting, sample year) |
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| 2020 | 22.8 | 12.7 | 19.5 (140 reporting, sample year) |
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| 2021 | 13.8 | 13.8 | 20.9 (133 reporting, sample year) |
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| 2022 | 19.3 | 12.0 | 20.6 (121 reporting, sample year) |
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| 2023 | 11.3 | 11.4 | 19.6 (122 reporting, sample year) |
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| 2024 | 9.8 | 8.7 | 15.9 (135 reporting, sample year) |
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| 2025 | 3.6 | 4.1 | 13.6 (139 reporting, sample year) |
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