| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.34 | 1.56 | 1.2 |
| 2024 | 1.33 | 1.77 | 1.08 |
| 2023 | 2.05 | 2.62 | 1.65 |
| 2022 | 2.76 | 3.51 | 2.25 |
| 2021 | 2.26 | 4.07 | 1.45 |
| 2020 | 1.53 | 2.22 | 1.03 |
| 2019 | 1.75 | 2.78 | 1.26 |
| 2018 | 2.55 | 4.1 | 1.41 |
| 2017 | 5.52 | 8.85 | 3.97 |
| 2016 | 12.41 | 23.81 | 7.81 |
| 2015 | 23.84 | 34.59 | 12.69 |
| 2014 | 21.21 | 25.06 | 17.75 |
| 2013 | 19.12 | 27.75 | 14.06 |
| 2012 | 14.58 | 20.82 | 9.71 |
| 2011 | 17.86 | 22.62 | 9.64 |
| 2010 | 24.94 | 33.87 | 18.04 |
| 2009 | 14.37 | 21.47 | 6.18 |
| 2008 | 11.49 | 24.45 | 4.83 |
| 2007 | 20.13 | 30.14 | 12.89 |
| 2006 | 13.18 | 17.49 | 9.1 |
| 2005 | 11.38 | 17.19 | 4.06 |
| 2004 | 6.52 | 10.22 | 4.57 |