| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.79 | 3.54 | 2.6 |
| 2024 | 2.32 | 2.75 | 1.82 |
| 2023 | 2.15 | 2.62 | 1.95 |
| 2022 | 2.27 | 3.3 | 2.03 |
| 2021 | 2.66 | 3.46 | 2.12 |
| 2020 | 3.44 | 4.35 | 2.76 |
| 2019 | 3.31 | 4.49 | 2.45 |
| 2018 | 3.29 | 4.28 | 2.43 |
| 2017 | 5.05 | 6.85 | 3.71 |
| 2016 | 5.31 | 7.37 | 4.39 |
| 2015 | 4.68 | 7.13 | 2.28 |
| 2014 | 3.52 | 7.6 | 1.97 |
| 2013 | 0.93 | 6.94 | 0.52 |
| 2012 | 1.14 | 2.28 | 0.45 |
| 2011 | 4.03 | 6.11 | 2.15 |
| 2010 | 7.9 | 11.75 | 5.43 |
| 2009 | 8.55 | 10.91 | 5.18 |
| 2008 | 7.55 | 14.65 | 3.55 |
| 2007 | 14.47 | 22.58 | 9.48 |
| 2006 | 10.31 | 13.07 | 8.13 |
| 2005 | 6.74 | 9.49 | 3.1 |
| 2004 | 5.29 | 9.27 | 3.28 |