| Year | Value (SE) |
|---|---|
| 2012 | 0.9690 (0.0225) |
| 2013 | 0.9230 (0.0525) |
| 2014 | 0.7820 (0.0417) |
| 2015 | 1.3050 (0.1797) |
| 2016 | 0.9850 (0.0392) |
| 2017 | 1.0250 (0.0270) |
| 2018 | 0.8880 (0.0388) |
| 2020 | 1.0660 (0.2139) |
| 2021 | 1.0000 (0.2776) |
| 2022 | 0.9470 (0.1950) |
| 2023 | 1.0070 (0.0560) |
| 2025 | 1.8680 (0.6755) |
