| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.69 | 3.3 | 1.11 |
| 2024 | 1.12 | 1.61 | 0.81 |
| 2023 | 1.33 | 1.56 | 1.12 |
| 2022 | 1.23 | 1.47 | 0.97 |
| 2021 | 1.24 | 1.57 | 1.09 |
| 2020 | 1.43 | 1.93 | 1.09 |
| 2019 | 1.27 | 1.64 | 0.94 |
| 2018 | 1.08 | 1.41 | 0.85 |
| 2017 | 3.6 | 8.73 | 1.13 |
| 2016 | 7.15 | 9.75 | 5.57 |
| 2015 | 9.96 | 17.13 | 6.56 |
| 2014 | 4.12 | 8.21 | 2.36 |
| 2013 | 2.38 | 3.07 | 1.97 |
| 2012 | 2.23 | 2.91 | 1.62 |
| 2011 | 3.84 | 5.69 | 2.64 |
| 2010 | 10.11 | 17.08 | 5.18 |
| 2009 | 15.8 | 23.04 | 6.74 |
| 2008 | 11.19 | 21.56 | 4.31 |
| 2007 | 12.48 | 18.08 | 5.79 |
| 2006 | 5.96 | 9.43 | 4.27 |
| 2005 | 4.84 | 6.67 | 3.67 |
| 2004 | 6.21 | 11.66 | 3.71 |