| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 0.48 | 0.61 | 0.39 |
| 2023 | 0.44 | 0.51 | 0.37 |
| 2022 | 0.4 | 0.6 | 0.29 |
| 2021 | 1.26 | 2.21 | 0.56 |
| 2020 | 1.22 | 1.73 | 0.62 |
| 2019 | 0.44 | 0.7 | 0.3 |
| 2018 | 0.37 | 0.49 | 0.28 |
| 2017 | 0.42 | 0.55 | 0.37 |
| 2016 | 0.41 | 0.47 | 0.37 |
| 2015 | 0.58 | 0.88 | 0.37 |
| 2014 | 0.28 | 0.4 | 0.23 |
| 2013 | 0.28 | 0.36 | 0.23 |
| 2012 | 0.28 | 0.34 | 0.24 |
| 2011 | 0.37 | 0.53 | 0.25 |
| 2010 | 0.32 | 0.44 | 0.23 |
| 2009 | 0.28 | 0.39 | 0.17 |
| 2008 | 0.28 | 0.4 | 0.13 |
| 2007 | 0.29 | 0.46 | 0.12 |
| 2006 | 0.12 | 0.14 | 0.09 |
| 2005 | 0.12 | 0.18 | 0.1 |