| Year | Value (SE) |
|---|---|
| 2012 | 0.7242 (0.0586) |
| 2013 | 0.8886 (0.1195) |
| 2014 | 0.8422 (0.1371) |
| 2015 | 0.7242 (0.1743) |
| 2016 | 0.7557 (0.0706) |
| 2017 | 0.8701 (0.0808) |
| 2018 | 0.6536 (0.1165) |
| 2020 | 1.0591 (0.5267) |
| 2021 | 0.6722 (0.6908) |
| 2022 | 0.6737 (0.3243) |
| 2023 | 0.6940 (0.2342) |
| 2025 | 0.3672 (0.2472) |
