| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.59 | 2.21 | 1.34 |
| 2024 | 1.33 | 1.77 | 1.04 |
| 2023 | 1.3 | 1.47 | 1.13 |
| 2022 | 1.49 | 2.08 | 1.26 |
| 2021 | 1.49 | 2.37 | 1.18 |
| 2020 | 1.55 | 2.58 | 1.19 |
| 2019 | 1.32 | 1.61 | 1.11 |
| 2018 | 1.37 | 1.73 | 1.13 |
| 2017 | 2.26 | 4.13 | 1.37 |
| 2016 | 3.74 | 5.24 | 2.42 |
| 2015 | 2.51 | 4.68 | 1.54 |
| 2014 | 1.36 | 1.99 | 0.92 |
| 2013 | 1.94 | 3.08 | 1.17 |
| 2012 | 1.88 | 3.35 | 0.95 |
| 2011 | 30.86 | 270.44 | 2.8 |
| 2010 | 9.35 | 16 | 5.33 |
| 2009 | 3.7 | 5.33 | 2.09 |
| 2008 | 4 | 9.31 | 1.64 |
| 2007 | 7.58 | 10.71 | 3.93 |
| 2006 | 3.56 | 4.53 | 2.68 |
| 2005 | 4.22 | 7.6 | 2.94 |
| 2004 | 4.97 | 8.41 | 2.09 |