| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.21 | 3.18 | 1.43 |
| 2024 | 1.74 | 2.71 | 1.01 |
| 2023 | 3.09 | 4.54 | 2.04 |
| 2022 | 8.08 | 13.71 | 3.28 |
| 2021 | 5.32 | 9.9 | 2.45 |
| 2020 | 2.47 | 4.26 | 2.03 |
| 2019 | 2.77 | 3.86 | 2.32 |
| 2018 | 2.87 | 3.45 | 2.38 |
| 2017 | 4.77 | 6.49 | 3.25 |
| 2016 | 4.95 | 6.75 | 4.15 |
| 2015 | 6.87 | 11.16 | 3.64 |
| 2014 | 3.97 | 4.42 | 3.46 |
| 2013 | 3.27 | 4.23 | 2.6 |
| 2012 | 2.81 | 3.86 | 2.24 |
| 2011 | 4.81 | 6.4 | 2.92 |
| 2010 | 6.51 | 8.35 | 4.8 |
| 2009 | 4.31 | 7.54 | 1.44 |
| 2008 | 4.19 | 10.57 | 1.12 |
| 2007 | 6.39 | 11.65 | 2.34 |
| 2006 | 1.72 | 2.46 | 1.17 |
| 2005 | 1.54 | 2.1 | 1.06 |
| 2004 | 2.6 | 3.26 | 2.05 |