| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.19 | 1.72 | 0.45 |
| 2024 | 1.51 | 2.18 | 1.13 |
| 2023 | 2.41 | 4.17 | 1.74 |
| 2022 | 2.51 | 4.03 | 0.8 |
| 2021 | 0.84 | 1.03 | 0.72 |
| 2020 | 0.87 | 1.02 | 0.7 |
| 2019 | 1.09 | 1.59 | 0.8 |
| 2018 | 1.44 | 2.39 | 0.93 |
| 2017 | 3.13 | 4.97 | 2.3 |
| 2016 | 4.46 | 6.03 | 3.55 |
| 2015 | 5.82 | 10.36 | 4.23 |
| 2014 | 4.4 | 5.48 | 3.66 |
| 2013 | 4.87 | 6.87 | 3.66 |
| 2012 | 4.91 | 6 | 4.5 |
| 2011 | 7.2 | 9.3 | 4.57 |
| 2010 | 10.4 | 14.43 | 8.09 |
| 2009 | 11.37 | 14.81 | 5.27 |
| 2008 | 11.77 | 25.42 | 4.21 |
| 2007 | 16.15 | 22.58 | 9.52 |
| 2006 | 8.67 | 11.31 | 6.74 |
| 2005 | 6.25 | 8.58 | 5.15 |
| 2004 | 8.36 | 13.98 | 5.51 |