| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.79 | 10.03 | 5.35 |
| 2024 | 6.61 | 8.72 | 4.59 |
| 2023 | 12.52 | 15.82 | 7.97 |
| 2022 | 13.09 | 17.97 | 7.29 |
| 2021 | 9.74 | 15.33 | 7.04 |
| 2020 | 5.19 | 16.18 | 2.66 |
| 2019 | 3.21 | 4.25 | 2.02 |
| 2018 | 2.73 | 3.71 | 1.92 |
| 2017 | 3.64 | 4.32 | 3.06 |
| 2016 | 3.14 | 4.38 | 2.13 |
| 2015 | 3.04 | 4.44 | 2.15 |
| 2014 | 2.42 | 3.33 | 1.98 |
| 2013 | 3.64 | 6.05 | 2.42 |
| 2012 | 6.01 | 7.89 | 3.93 |
| 2011 | 6.43 | 8.85 | 4.53 |
| 2010 | 5.89 | 8.9 | 3.99 |
| 2009 | 2.64 | 4.76 | 1.81 |
| 2008 | 2.27 | 3.58 | 1.23 |
| 2007 | 2.61 | 3.78 | 1.29 |
| 2006 | 1.07 | 1.45 | 0.74 |
| 2005 | 1.26 | 1.54 | 0.95 |
| 2004 | 2.66 | 4.91 | 1.64 |