| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.54 | 4.06 | 3.01 |
| 2024 | 3.23 | 4.54 | 2.4 |
| 2023 | 4.18 | 5.04 | 3.55 |
| 2022 | 4.04 | 5.71 | 3.03 |
| 2021 | 3.81 | 5.64 | 2.95 |
| 2020 | 2.96 | 4.54 | 1.95 |
| 2019 | 2.59 | 3.38 | 2.11 |
| 2018 | 2.9 | 4.16 | 1.9 |
| 2017 | 5.81 | 8.27 | 3.98 |
| 2016 | 7.38 | 9.52 | 5.12 |
| 2015 | 6.65 | 12.49 | 4.32 |
| 2014 | 5.67 | 7.01 | 4.49 |
| 2013 | 4.81 | 5.95 | 3.48 |
| 2012 | 2.72 | 3.65 | 2.23 |
| 2011 | 3.75 | 4.57 | 2.58 |
| 2010 | 4.95 | 6.21 | 3.95 |
| 2009 | 3.58 | 5.87 | 1.7 |
| 2008 | 3.08 | 5.88 | 1.36 |
| 2007 | 4.91 | 7.81 | 2.78 |
| 2006 | 2.52 | 3.19 | 1.81 |
| 2005 | 2.32 | 3.44 | 1.55 |
| 2004 | 4.17 | 8 | 2.03 |