| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.14 | 2.24 | 1.98 |
| 2024 | 2.21 | 3.46 | 1.69 |
| 2023 | 2.59 | 4.33 | 1.88 |
| 2022 | 2.19 | 3.41 | 1.69 |
| 2021 | 2.88 | 4.26 | 2.17 |
| 2020 | 1.93 | 3.34 | 1.39 |
| 2019 | 2.03 | 2.77 | 1.69 |
| 2018 | 2.67 | 3.56 | 1.78 |
| 2017 | 4.2 | 6.31 | 3.29 |
| 2016 | 5.97 | 7.68 | 4.67 |
| 2015 | 7 | 13.16 | 4.67 |
| 2014 | 4.92 | 5.72 | 4.22 |
| 2013 | 5.17 | 6.76 | 4.21 |
| 2012 | 5.64 | 6.94 | 4.01 |
| 2011 | 7.8 | 9.98 | 5.45 |
| 2010 | 8.07 | 10.5 | 5.83 |
| 2009 | 5.63 | 8.63 | 3.77 |
| 2008 | 5.8 | 9 | 3.24 |
| 2007 | 7.06 | 10.66 | 3.64 |
| 2006 | 2.51 | 3.77 | 1.54 |
| 2005 | 1.77 | 2.35 | 1.16 |
| 2004 | 1.91 | 3.18 | 1.17 |