| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.49 | 4.52 | 2.66 |
| 2024 | 2.67 | 3.68 | 2.14 |
| 2023 | 3.24 | 3.65 | 2.88 |
| 2022 | 3.59 | 4.18 | 3 |
| 2021 | 2.8 | 3.92 | 2.28 |
| 2020 | 3.06 | 3.58 | 2.68 |
| 2019 | 3.13 | 4.18 | 2.68 |
| 2018 | 4.94 | 6.94 | 3.04 |
| 2017 | 9.28 | 14.32 | 6.25 |
| 2016 | 13.55 | 16.77 | 8.44 |
| 2015 | 9.08 | 15.69 | 4.9 |
| 2014 | 3.72 | 5.61 | 2.85 |
| 2013 | 6.66 | 10.81 | 3.72 |
| 2012 | 8.73 | 12.88 | 4.35 |
| 2011 | 14.24 | 25.91 | 5.73 |
| 2010 | 15.53 | 27.67 | 9.75 |
| 2009 | 5.66 | 10.61 | 2.8 |
| 2008 | 6.54 | 17.84 | 1.56 |
| 2007 | 10.92 | 18.55 | 2.88 |
| 2006 | 2.52 | 3.55 | 1.26 |
| 2005 | 1.43 | 1.84 | 1.09 |
| 2004 | 2.16 | 3.62 | 1.34 |