| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 16.2 | 17.9 | 12.91 |
| 2024 | 12.91 | 19.67 | 10.52 |
| 2023 | 12.29 | 14.78 | 10.13 |
| 2022 | 18.11 | 28.33 | 12.96 |
| 2021 | 30.16 | 35.94 | 25.89 |
| 2020 | 23.36 | 34.62 | 18.66 |
| 2019 | 28.2 | 50.35 | 20.48 |
| 2018 | 27.6 | 34.78 | 21.04 |
| 2017 | 29.48 | 35.75 | 25.87 |
| 2016 | 36.55 | 55.46 | 29.7 |
| 2015 | 33.27 | 66.24 | 14.41 |
| 2014 | 10.59 | 17.22 | 8.16 |
| 2013 | 8.5 | 10.5 | 6.97 |
| 2012 | 6.41 | 9.46 | 4.51 |
| 2011 | 9.7 | 15.11 | 5.68 |
| 2010 | 11.95 | 14.17 | 10.1 |
| 2009 | 10.51 | 15.25 | 4.99 |
| 2008 | 8.59 | 16.5 | 3.92 |
| 2007 | 14.42 | 22.15 | 6.14 |
| 2006 | 4.8 | 6.65 | 3.39 |
| 2005 | 2.87 | 3.98 | 1.48 |
| 2004 | 2.74 | 4.65 | 1.84 |