| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.02 | 2.15 | 1.87 |
| 2024 | 2.27 | 2.88 | 1.86 |
| 2023 | 2.83 | 4.05 | 2.18 |
| 2022 | 3.58 | 5.54 | 2.44 |
| 2021 | 5.17 | 6.98 | 3.9 |
| 2020 | 6.71 | 11.34 | 4.33 |
| 2019 | 3.36 | 4.48 | 2.21 |
| 2018 | 2.08 | 2.5 | 1.79 |
| 2017 | 2.23 | 2.76 | 1.76 |
| 2016 | 2.09 | 2.89 | 1.58 |
| 2015 | 1.97 | 2.86 | 1.26 |
| 2014 | 1.48 | 1.76 | 1.2 |
| 2013 | 1.22 | 1.38 | 1.07 |
| 2012 | 1.34 | 1.69 | 1.01 |
| 2011 | 2.11 | 2.69 | 1.64 |
| 2010 | 2.68 | 3.1 | 2.27 |
| 2009 | 2.14 | 2.59 | 1.79 |
| 2008 | 1.89 | 3.21 | 1.22 |
| 2007 | 3.02 | 4.29 | 2 |
| 2006 | 1.57 | 2.22 | 1.21 |
| 2005 | 1.78 | 2.27 | 1.32 |
| 2004 | 2.25 | 2.9 | 1.84 |
| 2003 | 2.31 | 2.73 | 2.09 |