| Year | Value (SE) |
|---|---|
| 2012 | 0.7330 (0.0582) |
| 2013 | 0.9170 (0.1182) |
| 2014 | 0.6590 (0.1052) |
| 2015 | 0.8810 (0.1780) |
| 2016 | 0.8170 (0.0680) |
| 2017 | 0.9810 (0.0884) |
| 2018 | 0.6780 (0.1194) |
| 2020 | 1.7800 (0.8091) |
| 2021 | 0.2000 (0.1977) |
| 2022 | 0.9080 (0.3930) |
| 2023 | 0.7720 (0.2570) |
| 2025 | 0.6050 (0.3431) |
