| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.23 | 6.44 | 5.82 |
| 2024 | 3.29 | 7.35 | 1.48 |
| 2023 | 2.45 | 3.7 | 1.52 |
| 2022 | 3.32 | 4.09 | 2.29 |
| 2021 | 2.73 | 3.11 | 2.36 |
| 2020 | 4.14 | 6.04 | 2.93 |
| 2019 | 4.21 | 5.87 | 2.12 |
| 2018 | 2.93 | 4.93 | 1.76 |
| 2017 | 3.44 | 4.84 | 2.07 |
| 2016 | 2.44 | 3.58 | 1.99 |
| 2015 | 4.42 | 7.18 | 2.72 |
| 2014 | 1.91 | 3.23 | 1.33 |
| 2013 | 2.12 | 2.64 | 1.74 |
| 2012 | 2.27 | 2.93 | 1.69 |
| 2011 | 2.79 | 3.26 | 2.29 |
| 2010 | 3.24 | 5.42 | 2.12 |
| 2009 | 4.3 | 6.18 | 2.62 |
| 2008 | 5.44 | 10.09 | 2.23 |
| 2007 | 5.78 | 8.78 | 1.82 |
| 2006 | 1.3 | 1.83 | 0.94 |
| 2005 | 0.94 | 1.27 | 0.76 |
| 2004 | 1.41 | 2.54 | 0.79 |