| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.2 | 8.11 | 5.15 |
| 2024 | 10.26 | 13.75 | 6.07 |
| 2023 | 13.58 | 16.04 | 10.64 |
| 2022 | 11.3 | 13.1 | 9.37 |
| 2021 | 12.86 | 16.34 | 8.26 |
| 2020 | 8.12 | 11.5 | 4.43 |
| 2019 | 10.77 | 16.14 | 7.42 |
| 2018 | 11.34 | 13.14 | 8.45 |
| 2017 | 13.26 | 20.05 | 10.48 |
| 2016 | 10.46 | 13.88 | 6.57 |
| 2015 | 5.16 | 12.26 | 2.22 |
| 2014 | 1.84 | 2.72 | 1.4 |
| 2013 | 1.47 | 1.84 | 1.12 |
| 2012 | 1.7 | 1.99 | 1.2 |
| 2011 | 2.39 | 3.08 | 1.6 |
| 2010 | 2.4 | 3 | 1.68 |
| 2009 | 1.39 | 2.66 | 0.64 |
| 2008 | 1.16 | 2.15 | 0.5 |
| 2007 | 1.37 | 1.9 | 0.77 |
| 2006 | 0.82 | 1.05 | 0.68 |
| 2005 | 0.97 | 1.46 | 0.71 |
| 2004 | 2.04 | 3.69 | 1.14 |