| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.07 | 5.14 | 3.24 |
| 2024 | 2.91 | 5.34 | 2.2 |
| 2023 | 3.53 | 5.28 | 1.98 |
| 2022 | 2.01 | 2.62 | 1.33 |
| 2021 | 1.51 | 2.17 | 1.28 |
| 2020 | 2.01 | 2.57 | 1.68 |
| 2019 | 2.52 | 3.64 | 1.94 |
| 2018 | 3.17 | 4.4 | 2.28 |
| 2017 | 6.66 | 12.48 | 4.09 |
| 2016 | 6.25 | 8.12 | 4.51 |
| 2015 | 6.03 | 8.85 | 2.88 |
| 2014 | 2.91 | 5.93 | 1.79 |
| 2013 | 1.83 | 2.38 | 1.53 |
| 2012 | 1.81 | 2.34 | 1.36 |
| 2011 | 2.43 | 3.52 | 1.57 |
| 2010 | 3.04 | 4.47 | 2.06 |
| 2009 | 2.75 | 4.45 | 1.13 |
| 2008 | 2.11 | 4.73 | 0.79 |
| 2007 | 3.68 | 5.55 | 1.37 |
| 2006 | 1.52 | 2 | 1.22 |
| 2005 | 1.56 | 1.98 | 1.14 |
| 2004 | 2.45 | 4.42 | 1.4 |