| Year | Value (SE) |
|---|---|
| 2010 | 0.8960 (0.1263) |
| 2011 | 0.6310 (0.0569) |
| 2012 | 0.5750 (0.0460) |
| 2013 | 0.9180 (0.1182) |
| 2014 | 0.8670 (0.1078) |
| 2016 | 0.6770 (0.0344) |
| 2017 | 0.6620 (0.0627) |
| 2018 | 0.7610 (0.1289) |
| 2019 | 0.5400 (0.0938) |
| 2020 | 0.5800 (0.1258) |
| 2021 | 0.5690 (0.1353) |
| 2022 | 0.4060 (0.1421) |
