| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.9 | 5.03 | 2.12 |
| 2024 | 2.53 | 3.45 | 2.04 |
| 2023 | 3.29 | 4.32 | 2.71 |
| 2022 | 4.26 | 5.88 | 2.92 |
| 2021 | 3.27 | 4.03 | 2.95 |
| 2020 | 3.55 | 4.9 | 3.18 |
| 2019 | 3.71 | 5 | 3.17 |
| 2018 | 3.88 | 4.8 | 2.99 |
| 2017 | 4.3 | 5.3 | 3.54 |
| 2016 | 5.06 | 5.86 | 4.17 |
| 2015 | 2.98 | 5.78 | 1.17 |
| 2014 | 1.25 | 1.87 | 1 |
| 2013 | 1.43 | 2.1 | 1.11 |
| 2012 | 1.39 | 1.82 | 1.12 |
| 2011 | 1.78 | 2.37 | 1.32 |
| 2010 | 2.16 | 2.97 | 1.32 |
| 2009 | 2.23 | 2.9 | 1.72 |
| 2008 | 2.11 | 3.44 | 1.3 |
| 2007 | 2.24 | 3.3 | 1.1 |
| 2006 | 1.01 | 1.16 | 0.75 |
| 2005 | 1.01 | 1.62 | 0.68 |
| 2004 | 1.34 | 1.96 | 0.91 |