| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.36 | 2.19 | 1.01 |
| 2024 | 1.09 | 1.43 | 0.78 |
| 2023 | 2.27 | 3.74 | 1.32 |
| 2022 | 3.83 | 5.91 | 2.78 |
| 2021 | 3.85 | 5.73 | 2.61 |
| 2020 | 4.44 | 5.66 | 3.85 |
| 2019 | 4.66 | 7.23 | 3.48 |
| 2018 | 15.41 | 27.33 | 5.58 |
| 2017 | 27.09 | 36.43 | 18.49 |
| 2016 | 25.47 | 31.98 | 18.13 |
| 2015 | 17.76 | 34.31 | 6.76 |
| 2014 | 7.36 | 8.88 | 6.08 |
| 2013 | 5.73 | 8.62 | 3.95 |
| 2012 | 3.56 | 4.69 | 2.47 |
| 2011 | 3.91 | 5.84 | 2.65 |
| 2010 | 4.23 | 5.17 | 3.07 |
| 2009 | 2.13 | 4.11 | 0.77 |
| 2008 | 1.39 | 2.94 | 0.55 |
| 2007 | 2.78 | 4.58 | 1.68 |
| 2006 | 2.05 | 2.47 | 1.69 |
| 2005 | 1.16 | 1.86 | 0.72 |
| 2004 | 1.51 | 2.77 | 0.89 |