| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.4 | 1.58 | 1.27 |
| 2024 | 1.18 | 1.8 | 0.92 |
| 2023 | 1.24 | 1.43 | 1.11 |
| 2022 | 1.31 | 1.82 | 1.03 |
| 2021 | 1.75 | 2.3 | 1.51 |
| 2020 | 2.02 | 2.44 | 1.63 |
| 2019 | 1.72 | 2.12 | 1.27 |
| 2018 | 1.43 | 1.89 | 1.2 |
| 2017 | 1.44 | 1.62 | 1.29 |
| 2016 | 1.45 | 1.69 | 1.24 |
| 2015 | 2.72 | 4.29 | 1.24 |
| 2014 | 1.68 | 4.03 | 1.27 |
| 2013 | 1.58 | 2.06 | 1.24 |
| 2012 | 1.61 | 2.09 | 1.28 |
| 2011 | 1.88 | 2.41 | 1.59 |
| 2010 | 2.46 | 3.84 | 1.74 |
| 2009 | 3.22 | 4.44 | 2.32 |
| 2008 | 3.46 | 6.85 | 2.02 |
| 2007 | 11.87 | 22.08 | 5.56 |
| 2006 | 4.88 | 8.93 | 2.41 |
| 2005 | 2.45 | 2.89 | 1.98 |
| 2004 | 3.25 | 4.42 | 2.65 |