| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.98 | 3.43 | 2.47 |
| 2024 | 2.6 | 4.7 | 2.13 |
| 2023 | 2.68 | 3.6 | 2.17 |
| 2022 | 2.62 | 3.1 | 2.23 |
| 2021 | 3.6 | 4.94 | 2.9 |
| 2020 | 4.81 | 6.28 | 3.51 |
| 2019 | 5.41 | 7.45 | 3.86 |
| 2018 | 4.78 | 6.5 | 2.81 |
| 2017 | 14.39 | 29.11 | 5.84 |
| 2016 | 14.52 | 33.07 | 9.98 |
| 2015 | 9.76 | 17.08 | 6.31 |
| 2014 | 6.72 | 8.09 | 4.93 |
| 2013 | 4.5 | 7.84 | 3.09 |
| 2012 | 3.18 | 4.56 | 1.89 |
| 2011 | 3.8 | 5.25 | 2.07 |
| 2010 | 3.81 | 5.17 | 2.6 |
| 2009 | 2.22 | 3.83 | 1.22 |
| 2008 | 2.02 | 3.66 | 0.67 |
| 2007 | 2.33 | 3.58 | 1.49 |
| 2006 | 0.83 | 1.49 | 0.53 |
| 2005 | 0.85 | 1.33 | 0.51 |
| 2004 | 1.98 | 5.29 | 0.7 |