| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.2 | 2.43 | 1.99 |
| 2024 | 1.95 | 2.71 | 1.45 |
| 2023 | 2.37 | 3.22 | 1.87 |
| 2022 | 3.21 | 4.22 | 2.39 |
| 2021 | 4.79 | 8.15 | 2.94 |
| 2020 | 2.54 | 3.2 | 2 |
| 2019 | 3.34 | 4.35 | 2.57 |
| 2018 | 3.86 | 5.58 | 2.77 |
| 2017 | 7.32 | 16.18 | 3.25 |
| 2016 | 10.97 | 15.78 | 6.46 |
| 2015 | 9.26 | 12.31 | 5.13 |
| 2014 | 7.02 | 10.26 | 5.4 |
| 2013 | 37.14 | 139.87 | 5.45 |
| 2012 | 14.7 | 33.53 | 3.78 |
| 2011 | 8.77 | 11.01 | 4.05 |
| 2010 | 7.54 | 10.57 | 5.44 |
| 2009 | 6.44 | 8.85 | 2.55 |
| 2008 | 3.42 | 5.58 | 1.69 |
| 2007 | 3.72 | 5.2 | 2.32 |
| 2006 | 2.45 | 3.73 | 1.72 |
| 2005 | 2.21 | 2.83 | 1.26 |
| 2004 | 2.71 | 3.64 | 2.13 |