| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.04 | 3.13 | 2.97 |
| 2024 | 3.4 | 4.63 | 1.96 |
| 2023 | 7.85 | 11.91 | 4.26 |
| 2022 | 10.18 | 16.74 | 6.68 |
| 2021 | 14.85 | 25.77 | 7.52 |
| 2020 | 5.12 | 12 | 2.94 |
| 2019 | 4.13 | 5.15 | 3.38 |
| 2018 | 6.51 | 10.59 | 3.23 |
| 2017 | 7.06 | 10.5 | 5.29 |
| 2016 | 5.46 | 7.13 | 4.08 |
| 2015 | 5.06 | 7.52 | 2.98 |
| 2014 | 3 | 4.41 | 1.94 |
| 2013 | 3.46 | 6.22 | 2.47 |
| 2012 | 6.8 | 8.93 | 4.03 |
| 2011 | 7.64 | 9.61 | 5.14 |
| 2010 | 6.67 | 10.64 | 4.11 |
| 2009 | 5.32 | 8.62 | 2.1 |
| 2008 | 3.35 | 6.83 | 1.6 |
| 2007 | 4.8 | 7.87 | 2.33 |
| 2006 | 1.87 | 2.53 | 1.48 |
| 2005 | 1.37 | 1.79 | 0.93 |
| 2004 | 1.65 | 3.27 | 1.04 |