| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 8 | 8.84 | 7.04 |
| 2024 | 6.29 | 11.86 | 2.9 |
| 2023 | 4.62 | 6.18 | 3.82 |
| 2022 | 6.52 | 9.42 | 3.9 |
| 2021 | 6.94 | 13.13 | 3.87 |
| 2020 | 3.8 | 4.78 | 3.15 |
| 2019 | 4.68 | 6.64 | 3.3 |
| 2018 | 5.66 | 8.12 | 4.12 |
| 2017 | 4.16 | 6.7 | 2.74 |
| 2016 | 9.94 | 17.87 | 3.55 |
| 2015 | 18.43 | 27.22 | 10.96 |
| 2014 | 8.83 | 16.14 | 6.06 |
| 2013 | 6.87 | 9.58 | 3.11 |
| 2012 | 3.21 | 5.14 | 2.13 |
| 2011 | 12.57 | 19.78 | 3.28 |
| 2010 | 27.53 | 175.7 | 5.24 |
| 2009 | 49.23 | 173.43 | 19.84 |
| 2008 | 30.67 | 64.88 | 10.68 |
| 2007 | 51.83 | 139.54 | 27.25 |
| 2006 | 23.78 | 47.27 | 1.57 |
| 2005 | 1.13 | 1.94 | 0.29 |
| 2004 | 0.65 | 1.09 | 0.4 |