| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.04 | 3.09 | 1.16 |
| 2024 | 1.16 | 1.74 | 0.8 |
| 2023 | 1.5 | 1.7 | 1.26 |
| 2022 | 1.39 | 1.67 | 1 |
| 2021 | 1.43 | 1.91 | 0.95 |
| 2020 | 1.27 | 1.6 | 1.03 |
| 2019 | 1.37 | 1.87 | 1.13 |
| 2018 | 1.58 | 2.21 | 1.16 |
| 2017 | 2.47 | 3.25 | 1.86 |
| 2016 | 2.94 | 3.73 | 2.24 |
| 2015 | 3.6 | 6.24 | 2.13 |
| 2014 | 1.9 | 2.82 | 1.41 |
| 2013 | 1.48 | 1.75 | 1.22 |
| 2012 | 1.77 | 2.19 | 1.17 |
| 2011 | 2.69 | 3.68 | 1.78 |
| 2010 | 3.78 | 4.54 | 3.07 |
| 2009 | 3.5 | 5.06 | 1.71 |
| 2008 | 2.36 | 3.87 | 1.11 |
| 2007 | 3.76 | 5.07 | 2.3 |
| 2006 | 2.39 | 4.27 | 1.76 |
| 2005 | 2.66 | 3.8 | 1.78 |
| 2004 | 4.4 | 5.52 | 3.09 |
| 2003 | 4.98 | 6.12 | 3.61 |