| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.36 | 2.81 | 2.06 |
| 2024 | 2.61 | 3.44 | 2.15 |
| 2023 | 4.2 | 7.12 | 2.64 |
| 2022 | 5.95 | 10.3 | 3.24 |
| 2021 | 3.33 | 8.62 | 1.56 |
| 2020 | 1.59 | 1.84 | 1.42 |
| 2019 | 1.54 | 2.07 | 0.88 |
| 2018 | 1.29 | 1.79 | 0.76 |
| 2017 | 2.08 | 2.82 | 1.64 |
| 2016 | 2.54 | 3.98 | 1.92 |
| 2015 | 3.3 | 5.52 | 2.01 |
| 2014 | 2.15 | 2.76 | 1.89 |
| 2013 | 2.49 | 3.18 | 2.01 |
| 2012 | 3.04 | 4.9 | 2.06 |
| 2011 | 5.18 | 6.93 | 3.86 |
| 2010 | 4.14 | 5.53 | 2.88 |
| 2009 | 3.41 | 4.5 | 2.35 |
| 2008 | 5.01 | 12.7 | 1.64 |
| 2007 | 2.69 | 4.19 | 1.18 |
| 2006 | 1.18 | 1.45 | 1.03 |
| 2005 | 1.3 | 1.68 | 1.03 |