| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.73 | 1.87 | 1.61 |
| 2024 | 2.05 | 2.95 | 1.52 |
| 2023 | 2.95 | 4.81 | 1.92 |
| 2022 | 2.3 | 3.83 | 1.77 |
| 2021 | 1.87 | 2.38 | 1.45 |
| 2020 | 1.94 | 2.24 | 1.65 |
| 2019 | 2.16 | 2.57 | 1.58 |
| 2018 | 2.19 | 2.79 | 1.51 |
| 2017 | 3.25 | 3.86 | 2.62 |
| 2016 | 3.59 | 4.28 | 3.03 |
| 2015 | 5.12 | 7.84 | 3.79 |
| 2014 | 5.68 | 7.29 | 4.64 |
| 2013 | 5.78 | 6.72 | 4.72 |
| 2012 | 4.04 | 5.67 | 2.79 |
| 2011 | 4.76 | 6.36 | 3.83 |
| 2010 | 6.68 | 8.44 | 4.84 |
| 2009 | 4.91 | 7.76 | 3.75 |
| 2008 | 4.74 | 6.64 | 3.08 |
| 2007 | 3.41 | 5.42 | 1.66 |
| 2006 | 1.31 | 1.65 | 1.04 |
| 2005 | 1.69 | 3.06 | 0.96 |
| 2004 | 3.51 | 5.64 | 2.17 |