| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.52 | 5.3 | 3.8 |
| 2024 | 3.74 | 5.14 | 2.36 |
| 2023 | 4.97 | 7.84 | 3.39 |
| 2022 | 5.02 | 6.6 | 3.88 |
| 2021 | 5.29 | 6.5 | 4.41 |
| 2020 | 4.1 | 5.98 | 2.49 |
| 2019 | 3.37 | 4.62 | 2.28 |
| 2018 | 5.9 | 9.41 | 2.59 |
| 2017 | 14.26 | 18.8 | 8.32 |
| 2016 | 15.15 | 24.14 | 7.74 |
| 2015 | 12.04 | 28.36 | 7.46 |
| 2014 | 9.03 | 12.39 | 6.26 |
| 2013 | 8.15 | 10.84 | 5.7 |
| 2012 | 372.95 | 1836.59 | 4.91 |
| 2011 | 605.38 | 1898.06 | 156.17 |
| 2010 | 133.69 | 227.15 | 55.52 |
| 2009 | 108.11 | 163.03 | 68.56 |
| 2008 | 14.99 | 16.92 | 12.98 |
| 2007 | 12 | 17.5 | 5.14 |
| 2006 | 6.54 | 9.13 | 4.86 |
| 2005 | 9.36 | 12.94 | 6.5 |
| 2004 | 17.61 | 29.78 | 9.98 |