| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 18.25 | 20.61 | 16.35 |
| 2024 | 14.16 | 27.09 | 9.83 |
| 2023 | 18.43 | 26.35 | 13.51 |
| 2022 | 13.33 | 23.96 | 6.19 |
| 2021 | 14.26 | 24.58 | 9.88 |
| 2020 | 21.36 | 28.24 | 16.26 |
| 2019 | 13.49 | 21.76 | 5.51 |
| 2018 | 5.68 | 8.31 | 3.06 |
| 2017 | 5.34 | 7.01 | 4.18 |
| 2016 | 6.87 | 9.09 | 5.58 |
| 2015 | 10.81 | 16.71 | 5.2 |
| 2014 | 6.74 | 9.42 | 3.35 |
| 2013 | 4.07 | 8.99 | 1.91 |
| 2012 | 2.52 | 3.22 | 1.66 |
| 2011 | 3.51 | 5.18 | 2.54 |
| 2010 | 5.08 | 5.99 | 3.63 |
| 2009 | 5.88 | 10.54 | 2.23 |
| 2008 | 3.23 | 5.52 | 1.45 |
| 2007 | 5.39 | 7.65 | 4.13 |
| 2006 | 3.73 | 4.45 | 3.33 |
| 2005 | 3.07 | 3.6 | 1.81 |
| 2004 | 4.37 | 6.87 | 2.53 |
| 2003 | 5.04 | 5.76 | 4.18 |