| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.79 | 10.92 | 3.53 |
| 2024 | 4.99 | 9.87 | 2.98 |
| 2023 | 3.9 | 5.43 | 2.5 |
| 2022 | 2.95 | 3.73 | 2.35 |
| 2021 | 2.72 | 5.01 | 1.73 |
| 2020 | 1.9 | 2.72 | 1.41 |
| 2019 | 2.56 | 3.41 | 2.11 |
| 2018 | 2.68 | 3.32 | 2.01 |
| 2017 | 4.06 | 5.77 | 3.04 |
| 2016 | 3.95 | 5.21 | 2.78 |
| 2015 | 2.49 | 5.21 | 1.6 |
| 2014 | 1.59 | 2.25 | 1.23 |
| 2013 | 1.22 | 1.48 | 1.04 |
| 2012 | 1.22 | 1.55 | 0.93 |
| 2011 | 2.06 | 3.13 | 1.14 |
| 2010 | 2.03 | 2.74 | 1.45 |
| 2009 | 1.59 | 2.16 | 0.99 |
| 2008 | 1.54 | 3.52 | 0.59 |
| 2007 | 2.7 | 4.19 | 1.15 |
| 2006 | 1.35 | 1.74 | 1 |
| 2005 | 1.02 | 1.39 | 0.81 |
| 2004 | 1.59 | 2.79 | 0.91 |