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Headline data
| Year | Value | UNIT_MEASURE |
|---|---|---|
| 2010 | 21.0 | Percent |
| 2011 | 21.0 | Percent |
| 2012 | 23.9 | Percent |
| 2013 | 26.5 | Percent |
| 2014 | 27.7 | Percent |
| 2015 | 25.9 | Percent |
| 2016 | 23.9 | Percent |
| 2017 | 25.8 | Percent |
| 2018 | 26.7 | Percent |
| 2019 | 33.9 | Percent |
| 2020 | 36.0 | Percent |
| 2021 | 1.1 | Percent |
| 2022 | 1.2 | Percent |
| 2023 | 1.2 | Percent |
| 2024 | 1.0 | Percent |
| 2025 | 1.0 | Percent |