| Year | Value (SE) |
|---|---|
| 2012 | 0.9574 (0.0419) |
| 2013 | 0.8944 (0.0844) |
| 2014 | 0.9994 (0.1291) |
| 2015 | 1.0727 (0.2456) |
| 2016 | 0.9111 (0.0606) |
| 2017 | 0.9092 (0.0380) |
| 2018 | 0.8560 (0.0699) |
| 2020 | 0.6343 (0.2289) |
| 2021 | 3.3610 (3.3876) |
| 2022 | 0.7027 (0.2179) |
| 2023 | 0.9053 (0.0861) |
| 2025 | 1.1339 (0.6759) |
