| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 4.24 | 5.05 | 3.6 |
| 2025 | 2.76 | 4.24 | 1.95 |
| 2024 | 1.76 | 2.61 | 1.22 |
| 2023 | 2.05 | 2.37 | 1.79 |
| 2022 | 1.8 | 2.15 | 1.38 |
| 2021 | 1.72 | 2.16 | 1.51 |
| 2020 | 1.97 | 2.47 | 1.7 |
| 2019 | 1.57 | 2.08 | 1.13 |
| 2018 | 1.62 | 2.52 | 1.03 |
| 2017 | 3.61 | 5.07 | 2.21 |
| 2016 | 4.59 | 7.14 | 3.55 |
| 2015 | 6.15 | 11.35 | 3.74 |
| 2014 | 3.82 | 5.56 | 2.59 |
| 2013 | 2.95 | 3.67 | 2.21 |
| 2012 | 3.36 | 5.29 | 1.75 |
| 2011 | 6.92 | 8.98 | 3.82 |
| 2010 | 5.75 | 8.41 | 3.93 |
| 2009 | 3.55 | 6.43 | 1.6 |
| 2008 | 2.86 | 6.23 | 1.22 |
| 2007 | 4.82 | 6.8 | 2.11 |
| 2006 | 2.17 | 2.81 | 1.73 |
| 2005 | 2.16 | 3.03 | 1.59 |
| 2004 | 4.2 | 7.81 | 2.41 |