| Year | Value (SE) |
|---|---|
| 2012 | 0.8910 (0.1013) |
| 2013 | 0.6740 (0.0660) |
| 2014 | 1.1060 (0.0994) |
| 2015 | 0.9780 (0.1515) |
| 2016 | 0.8450 (0.0683) |
| 2017 | 0.9130 (0.0805) |
| 2018 | 0.7880 (0.0988) |
| 2019 | 1.2610 (0.1328) |
| 2020 | 0.7000 (0.1285) |
| 2021 | 0.7320 (0.1712) |
| 2022 | 1.5810 (0.6798) |
| 2023 | 1.3770 (0.2641) |
| 2024 | 0.7080 (0.2124) |
