| Year | Value (SE) |
|---|---|
| 2004 | 0.3876 (0.0418) |
| 2010 | 0.6279 (0.1139) |
| 2011 | 0.4966 (0.0835) |
| 2012 | 0.6425 (0.0685) |
| 2013 | 0.4065 (0.0695) |
| 2014 | 0.5427 (0.0731) |
| 2015 | 0.5220 (0.2003) |
| 2016 | 0.5523 (0.0384) |
| 2019 | 0.2993 (0.0509) |
| 2020 | 0.4816 (0.1484) |
| 2022 | 0.9803 (0.7173) |
| 2023 | 0.5150 (0.2300) |
