| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.11 | 9.35 | 4.58 |
| 2024 | 5.4 | 9.49 | 3.23 |
| 2023 | 4.35 | 5.58 | 3.81 |
| 2022 | 3.3 | 4.18 | 2.63 |
| 2021 | 3.93 | 5.3 | 3.41 |
| 2020 | 5.31 | 8.31 | 4.45 |
| 2019 | 7.05 | 10.07 | 5.23 |
| 2018 | 7.24 | 9.55 | 5.82 |
| 2017 | 11.12 | 14.12 | 8.69 |
| 2016 | 10.44 | 14.38 | 7.44 |
| 2015 | 17.79 | 28.19 | 10.54 |
| 2014 | 12.68 | 21.76 | 7.83 |
| 2013 | 9.74 | 12.87 | 6.11 |
| 2012 | 5.29 | 7 | 3.67 |
| 2011 | 5.14 | 6.56 | 3.85 |
| 2010 | 5.78 | 7.37 | 4.42 |
| 2009 | 6.95 | 21.34 | 4.43 |
| 2008 | 10.31 | 18.42 | 7.21 |
| 2007 | 5.6 | 8.56 | 2.34 |
| 2006 | 2.51 | 3.49 | 2.04 |
| 2005 | 2.01 | 2.69 | 1.33 |
| 2004 | 2.33 | 4.29 | 1.48 |