| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.24 | 1.56 | 1.03 |
| 2024 | 1.33 | 1.88 | 0.92 |
| 2023 | 1.84 | 2.44 | 1.4 |
| 2022 | 1.84 | 2.71 | 1.26 |
| 2021 | 2.14 | 2.84 | 1.6 |
| 2020 | 1.89 | 2.27 | 1.5 |
| 2019 | 2.04 | 3.11 | 1.54 |
| 2018 | 2.07 | 3.3 | 1.57 |
| 2017 | 3.76 | 6.37 | 2.91 |
| 2016 | 3.91 | 5.8 | 3.06 |
| 2015 | 5.01 | 8.75 | 2.92 |
| 2014 | 1.89 | 3.41 | 1.12 |
| 2013 | 1.39 | 2.39 | 0.92 |
| 2012 | 14.99 | 38.24 | 1.62 |
| 2011 | 20.93 | 24.76 | 14.35 |
| 2010 | 22.21 | 27.09 | 18.5 |
| 2009 | 15.14 | 20.99 | 9.22 |
| 2008 | 16.45 | 31.14 | 6.45 |
| 2007 | 20.25 | 31.55 | 9.7 |
| 2006 | 6.81 | 10.41 | 3.83 |
| 2005 | 3.32 | 4.63 | 2.1 |
| 2004 | 3.96 | 7.6 | 2.26 |