| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.48 | 1.76 | 1.27 |
| 2024 | 1.74 | 2.43 | 1.2 |
| 2023 | 2.27 | 3.12 | 1.75 |
| 2022 | 3.46 | 4.64 | 2.34 |
| 2021 | 3.44 | 5.25 | 2.04 |
| 2020 | 1.29 | 2.11 | 0.97 |
| 2019 | 1.15 | 1.54 | 0.95 |
| 2018 | 2.05 | 3.8 | 0.99 |
| 2017 | 2.89 | 4.14 | 2.2 |
| 2016 | 2.89 | 3.7 | 2.2 |
| 2015 | 4 | 4.74 | 2.7 |
| 2014 | 3.43 | 5.01 | 2.78 |
| 2013 | 3.42 | 4.6 | 2.18 |
| 2012 | 2.37 | 2.85 | 1.76 |
| 2011 | 4.55 | 6.95 | 2.42 |
| 2010 | 7.68 | 10.77 | 6.03 |
| 2009 | 5.24 | 9.48 | 1.93 |
| 2008 | 2.3 | 3.84 | 1.17 |
| 2007 | 2.78 | 3.98 | 1.13 |
| 2006 | 1.31 | 1.66 | 0.92 |
| 2005 | 1.5 | 1.89 | 1.17 |
| 2004 | 2.53 | 5.88 | 1.2 |