| Year | Value (SE) |
|---|---|
| 2012 | 0.9880 (0.0410) |
| 2013 | 0.9690 (0.0828) |
| 2014 | 1.2780 (0.1596) |
| 2015 | 0.8220 (0.1839) |
| 2016 | 0.9250 (0.0618) |
| 2017 | 0.8870 (0.0355) |
| 2018 | 0.9640 (0.0743) |
| 2020 | 0.5950 (0.2152) |
| 2021 | 3.3610 (3.3890) |
| 2022 | 0.7420 (0.2320) |
| 2023 | 0.8990 (0.0863) |
| 2025 | 0.6070 (0.3623) |
