| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.61 | 1.74 | 1.46 |
| 2024 | 1.48 | 1.98 | 0.95 |
| 2023 | 1.19 | 2.23 | 0.56 |
| 2022 | 1.6 | 2.27 | 0.83 |
| 2021 | 1.92 | 3.01 | 1.32 |
| 2020 | 3.63 | 5.11 | 2.47 |
| 2019 | 2.61 | 3.26 | 2.28 |
| 2018 | 3.75 | 5 | 2.5 |
| 2017 | 6.51 | 8.11 | 4.65 |
| 2016 | 8.75 | 11.5 | 7.45 |
| 2015 | 13.16 | 25.31 | 7.81 |
| 2014 | 10.01 | 11.76 | 7.79 |
| 2013 | 7.16 | 8.36 | 5.11 |
| 2012 | 5.84 | 6.9 | 4.56 |
| 2011 | 8.82 | 12.56 | 5.89 |
| 2010 | 13.52 | 18.02 | 9.87 |
| 2009 | 14.26 | 17.05 | 11.39 |
| 2008 | 16.92 | 23.17 | 11.69 |
| 2007 | 14.03 | 19.48 | 7.36 |
| 2006 | 5.51 | 7.6 | 3.89 |
| 2005 | 3.93 | 5.57 | 2.46 |