| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.12 | 6.97 | 5.17 |
| 2024 | 3.43 | 8.12 | 2.58 |
| 2023 | 3.45 | 4.14 | 2.63 |
| 2022 | 2.86 | 3.87 | 2.34 |
| 2021 | 3.43 | 5.64 | 2.44 |
| 2020 | 5.1 | 7.04 | 3.4 |
| 2019 | 3.31 | 4.53 | 2.52 |
| 2018 | 6.57 | 9.77 | 2.57 |
| 2017 | 11.29 | 12.74 | 9.72 |
| 2016 | 9.12 | 12.95 | 6.32 |
| 2015 | 15.23 | 21.16 | 5.6 |
| 2014 | 5.52 | 7.25 | 3.8 |
| 2013 | 5.31 | 7.06 | 4.38 |
| 2012 | 6.42 | 7.92 | 4.43 |
| 2011 | 9.12 | 11.82 | 6.73 |
| 2010 | 8.42 | 12.06 | 6.31 |
| 2009 | 6.43 | 7.99 | 5.03 |
| 2008 | 6.47 | 11.42 | 3.45 |
| 2007 | 6.44 | 9.93 | 3.46 |
| 2006 | 3.09 | 3.98 | 2.35 |
| 2005 | 2.62 | 3.66 | 1.76 |
| 2004 | 3.13 | 5.33 | 2.07 |