| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.58 | 5.02 | 4.03 |
| 2024 | 3.09 | 6.9 | 1.86 |
| 2023 | 3.12 | 3.85 | 2.61 |
| 2022 | 3.79 | 4.99 | 3.21 |
| 2021 | 4.35 | 5.26 | 3.76 |
| 2020 | 4.94 | 5.45 | 4.02 |
| 2019 | 4.59 | 5.76 | 3.38 |
| 2018 | 3.86 | 5.16 | 3.12 |
| 2017 | 8.49 | 13.17 | 4.89 |
| 2016 | 12.14 | 16.49 | 9.85 |
| 2015 | 4.88 | 26.67 | 2.84 |
| 2014 | 1.15 | 1.46 | 1.12 |
| 2013 | 0.96 | 1.23 | 0.72 |
| 2012 | 0.77 | 1.02 | 0.55 |
| 2011 | 1.39 | 1.77 | 0.91 |
| 2010 | 1.87 | 2.53 | 1.52 |
| 2009 | 1.55 | 2.2 | 1.03 |
| 2008 | 2.13 | 4.2 | 0.81 |
| 2007 | 2.76 | 4.45 | 0.88 |
| 2006 | 0.91 | 1.3 | 0.73 |
| 2005 | 0.95 | 1.62 | 0.68 |
| 2004 | 2.09 | 3.81 | 0.93 |