| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.32 | 3.78 | 2.85 |
| 2024 | 1.9 | 4.27 | 1.16 |
| 2023 | 1.76 | 2.15 | 1.5 |
| 2022 | 2.09 | 2.9 | 1.6 |
| 2021 | 2.29 | 3.52 | 1.7 |
| 2020 | 2.63 | 3.23 | 2.12 |
| 2019 | 2.95 | 4.92 | 1.97 |
| 2018 | 2.86 | 4.07 | 1.94 |
| 2017 | 4.59 | 5.98 | 3.65 |
| 2016 | 5.93 | 9.32 | 4.27 |
| 2015 | 5.98 | 9.69 | 3.59 |
| 2014 | 3.21 | 5.14 | 2 |
| 2013 | 2.13 | 2.46 | 1.73 |
| 2012 | 2.47 | 3.4 | 1.47 |
| 2011 | 5.7 | 9.33 | 2.38 |
| 2010 | 5 | 10.23 | 3 |
| 2009 | 3.17 | 5.63 | 1.36 |
| 2008 | 2.48 | 4.77 | 1.11 |
| 2007 | 4.1 | 6.74 | 1.7 |
| 2006 | 1.95 | 2.42 | 1.43 |
| 2005 | 2.17 | 2.86 | 1.72 |
| 2004 | 3.79 | 6.89 | 2.03 |