| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.77 | 5.44 | 4.21 |
| 2024 | 4.05 | 6.14 | 2.74 |
| 2023 | 2.85 | 4.53 | 1.7 |
| 2022 | 1.77 | 2.59 | 1.3 |
| 2021 | 2.12 | 2.61 | 1.56 |
| 2020 | 3.44 | 4.76 | 2.46 |
| 2019 | 2.46 | 4.76 | 1.75 |
| 2018 | 1.91 | 2.69 | 1.39 |
| 2017 | 4.27 | 6.97 | 2.51 |
| 2016 | 3.15 | 5 | 2.11 |
| 2015 | 4.78 | 7.63 | 2.9 |
| 2014 | 5.19 | 7.25 | 4 |
| 2013 | 3.59 | 9.04 | 1.82 |
| 2012 | 11.98 | 22.35 | 2.12 |
| 2011 | 14.73 | 19.34 | 9.61 |
| 2010 | 9.55 | 13.52 | 5.36 |
| 2009 | 15.39 | 22.85 | 8.74 |
| 2008 | 10.88 | 21.89 | 4.43 |
| 2007 | 19.19 | 30.87 | 7.3 |
| 2006 | 6.64 | 8.66 | 3.69 |
| 2005 | 3.86 | 6.12 | 1.36 |
| 2004 | 2.85 | 4.71 | 1.71 |