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Headline data
| Year | Value | Units | 
|---|---|---|
| 2015 | 64.4 | % | 
| 2016 | 65.6 | % | 
| 2017 | 65.9 | % | 
| 2018 | 66.1 | % | 
| 2019 | 66.5 | % | 
| 2020 | 67.1 | % | 
| 2021 | 68.3 | % | 
| 2022 | 70.0 | % | 
| 2023 | 73.8 | % | 
| 2024 | 82.3 | % |