| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.49 | 1.65 | 1.4 |
| 2024 | 2.04 | 3.65 | 1.13 |
| 2023 | 3.07 | 5.12 | 1.6 |
| 2022 | 1.8 | 2.32 | 1.21 |
| 2021 | 1.65 | 2.22 | 1.23 |
| 2020 | 1.86 | 2.73 | 1.31 |
| 2019 | 1.82 | 2.35 | 1.39 |
| 2018 | 2.64 | 3.97 | 1.72 |
| 2017 | 4.22 | 5.2 | 3.45 |
| 2016 | 4.37 | 5.56 | 3.73 |
| 2015 | 7.35 | 14.64 | 4.51 |
| 2014 | 4.8 | 6.19 | 3.43 |
| 2013 | 6.1 | 8.32 | 4.99 |
| 2012 | 6.56 | 9.11 | 4.75 |
| 2011 | 12.01 | 15.22 | 6.99 |
| 2010 | 15.28 | 24.35 | 9.5 |
| 2009 | 17.63 | 25.06 | 11.78 |
| 2008 | 23.49 | 47.55 | 7.66 |
| 2007 | 13.57 | 23.87 | 5.14 |
| 2006 | 3.81 | 5.56 | 2.78 |
| 2005 | 2.64 | 3.39 | 1.99 |
| 2004 | 3.38 | 6.1 | 2.22 |