| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 20.44 | 25.88 | 17.07 |
| 2024 | 19.18 | 27.06 | 13.72 |
| 2023 | 22.85 | 33.42 | 18.4 |
| 2022 | 15.5 | 21.46 | 12.04 |
| 2021 | 10.71 | 14.76 | 8.47 |
| 2020 | 12.17 | 16.68 | 9.11 |
| 2019 | 11.99 | 17.26 | 9.46 |
| 2018 | 12.48 | 17.47 | 9.16 |
| 2017 | 19.86 | 29.1 | 12.64 |
| 2016 | 25.54 | 30.15 | 19.41 |
| 2015 | 21.58 | 32.66 | 11.94 |
| 2014 | 9.54 | 16.67 | 4.98 |
| 2013 | 4.69 | 6.43 | 3.82 |
| 2012 | 4.49 | 6.01 | 3.54 |
| 2011 | 7.05 | 9.79 | 4.25 |
| 2010 | 7.75 | 10.58 | 5.77 |
| 2009 | 5.52 | 7.96 | 3.69 |
| 2008 | 4.01 | 7.24 | 2.18 |
| 2007 | 6.07 | 10.16 | 2.21 |
| 2006 | 2.14 | 2.69 | 1.67 |
| 2005 | 2.2 | 3.08 | 1.54 |
| 2004 | 3.5 | 5.1 | 2.56 |