| 2016 | 4.0 | Benchmark unavailable | 2.4 (145 reporting, sample year) |
|---|
| 2017 | 1.3 | Benchmark unavailable | 2.2 (145 reporting, sample year) |
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| 2018 | 2.5 | Benchmark unavailable | 2.2 (152 reporting, sample year) |
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| 2019 | 4.9 | Benchmark unavailable | 2.2 (153 reporting, sample year) |
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| 2020 | 4.1 | Benchmark unavailable | 2.2 (153 reporting, sample year) |
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| 2021 | 4.1 | Benchmark unavailable | 2.3 (155 reporting, sample year) |
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| 2022 | 5.4 | Benchmark unavailable | 1.9 (155 reporting, sample year) |
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| 2023 | 2.7 | Benchmark unavailable | 2.3 (155 reporting, sample year) |
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| 2024 | 12.0 | Benchmark unavailable | 2.4 (155 reporting, sample year) |
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| 2025 | 12.1 | Benchmark unavailable | 2.5 (143 reporting, sample year) |
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