| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.03 | 1.42 | 0.89 |
| 2024 | 0.87 | 1.65 | 0.35 |
| 2023 | 1.53 | 3.31 | 0.57 |
| 2022 | 3.15 | 4.32 | 1.94 |
| 2021 | 4.75 | 6.46 | 3.18 |
| 2020 | 6.48 | 8.99 | 5 |
| 2019 | 7.18 | 11.76 | 3.27 |
| 2018 | 4.43 | 6.81 | 3.07 |
| 2017 | 6.67 | 8.08 | 5.49 |
| 2016 | 6.21 | 7.39 | 4.94 |
| 2015 | 4.95 | 7.84 | 2.68 |
| 2014 | 3.78 | 4.66 | 2.72 |
| 2013 | 2.56 | 3.85 | 1.9 |
| 2012 | 3.09 | 5.44 | 1.64 |
| 2011 | 8.17 | 11.41 | 4.11 |
| 2010 | 9.89 | 13.64 | 6.87 |
| 2009 | 5.45 | 9.48 | 2.03 |
| 2008 | 3.81 | 6.25 | 1.35 |
| 2007 | 4.18 | 6.89 | 1.4 |
| 2006 | 1.58 | 1.99 | 1.25 |
| 2005 | 1.37 | 2 | 0.82 |
| 2004 | 1.49 | 2.43 | 1.06 |