| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 16.2 | 19.18 | 12.91 |
| 2024 | 5.9 | 21.15 | 3.02 |
| 2023 | 6.17 | 7.92 | 4.98 |
| 2022 | 4.76 | 5.66 | 3.36 |
| 2021 | 2.17 | 4.41 | 1.06 |
| 2020 | 1.73 | 2.68 | 1.4 |
| 2019 | 1.75 | 3.03 | 1.33 |
| 2018 | 3.4 | 5.05 | 1.5 |
| 2017 | 4.98 | 5.72 | 4.3 |
| 2016 | 5 | 6.47 | 3.8 |
| 2015 | 7.95 | 10.61 | 4.48 |
| 2014 | 6.27 | 7.07 | 5.34 |
| 2013 | 3.55 | 5.56 | 2.2 |
| 2012 | 2.25 | 2.42 | 1.99 |
| 2011 | 2.25 | 2.74 | 1.93 |
| 2010 | 3.19 | 4.44 | 2.4 |
| 2009 | 2.68 | 4.17 | 1.22 |
| 2008 | 5.57 | 19.53 | 1.01 |
| 2007 | 15.81 | 21.7 | 10.59 |
| 2006 | 8.12 | 12.33 | 4.92 |
| 2005 | 7.33 | 18.22 | 5.15 |
| 2004 | 6.83 | 10.09 | 4.55 |