| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 1.17 | 1.47 | 1.07 |
| 2025 | 1.16 | 1.4 | 0.96 |
| 2024 | 1.08 | 1.25 | 0.92 |
| 2023 | 1.34 | 1.82 | 0.92 |
| 2022 | 1.21 | 1.57 | 0.9 |
| 2021 | 1.68 | 2.47 | 1.34 |
| 2020 | 2.27 | 2.9 | 1.73 |
| 2019 | 3.75 | 5.2 | 2.51 |
| 2018 | 5.45 | 6.93 | 3.91 |
| 2017 | 5.25 | 6.73 | 3.58 |
| 2016 | 4.61 | 6.56 | 2.84 |
| 2015 | 3.83 | 6.81 | 2.13 |
| 2014 | 1.53 | 2.37 | 1.23 |
| 2013 | 1.91 | 2.38 | 1.47 |
| 2012 | 1.88 | 2.24 | 1.43 |
| 2011 | 2.62 | 3.46 | 1.44 |
| 2010 | 3.7 | 4.6 | 2.73 |
| 2009 | 5.44 | 7.89 | 3.95 |
| 2008 | 10.05 | 17.59 | 3.66 |
| 2007 | 11.69 | 15.94 | 5.16 |
| 2006 | 2.81 | 5.28 | 1.86 |
| 2005 | 3.3 | 4.39 | 2.29 |
| 2004 | 3.11 | 5.25 | 2.29 |