| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.99 | 3.11 | 2.65 |
| 2024 | 3.3 | 4.23 | 2.46 |
| 2023 | 3.83 | 6.03 | 2.74 |
| 2022 | 4.75 | 5.67 | 3.57 |
| 2021 | 4.27 | 6.3 | 3.13 |
| 2020 | 3.58 | 4.83 | 1.93 |
| 2019 | 6.15 | 20.81 | 1.7 |
| 2018 | 6.22 | 8.98 | 4.39 |
| 2017 | 9.89 | 13.88 | 8.35 |
| 2016 | 11.15 | 15.51 | 5.97 |
| 2015 | 9.33 | 14.83 | 6.08 |
| 2014 | 5.74 | 7.28 | 4.44 |
| 2013 | 4.42 | 5.19 | 3.69 |
| 2012 | 4.45 | 6.29 | 3.3 |
| 2011 | 7.19 | 9.83 | 4.59 |
| 2010 | 6.11 | 9.92 | 4.38 |
| 2009 | 3.88 | 6.73 | 1.85 |
| 2008 | 4.21 | 9.78 | 1.41 |
| 2007 | 7.84 | 12.12 | 3.13 |
| 2006 | 3.57 | 4.69 | 2.67 |
| 2005 | 2.48 | 3.35 | 1.51 |
| 2004 | 4.16 | 7.94 | 1.97 |