| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.82 | 4.08 | 3.44 |
| 2024 | 4.2 | 5.13 | 3.12 |
| 2023 | 6.5 | 8.71 | 4.94 |
| 2022 | 8.07 | 13.89 | 5.84 |
| 2021 | 14.77 | 20.35 | 11.07 |
| 2020 | 14.2 | 17.83 | 10.28 |
| 2019 | 6.74 | 11.07 | 4.49 |
| 2018 | 9.5 | 13.72 | 5.42 |
| 2017 | 11.42 | 15 | 9.57 |
| 2016 | 9.75 | 12.24 | 8.57 |
| 2015 | 11.99 | 17.32 | 7.66 |
| 2014 | 9.03 | 11.73 | 7.24 |
| 2013 | 7.7 | 10.11 | 5.16 |
| 2012 | 9.29 | 12.99 | 5.66 |
| 2011 | 24.42 | 43.7 | 10.71 |
| 2010 | 42.54 | 54.76 | 32.1 |
| 2009 | 23.24 | 39.44 | 13.21 |
| 2008 | 667.95 | 2093.77 | 13.73 |
| 2007 | 1551.81 | 1563.4 | 1401.09 |
| 2006 | 0.72 | 0.85 | 0.53 |
| 2005 | 0.66 | 0.94 | 0.35 |
| 2004 | 0.88 | 1.42 | 0.54 |