| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.46 | 1.83 | 1.24 |
| 2024 | 1.19 | 1.67 | 0.89 |
| 2023 | 1.95 | 2.58 | 1.5 |
| 2022 | 2.32 | 3.04 | 1.88 |
| 2021 | 1.75 | 2.38 | 1.45 |
| 2020 | 1.84 | 2.06 | 1.44 |
| 2019 | 2.44 | 4.89 | 1.64 |
| 2018 | 6.02 | 12.25 | 2.79 |
| 2017 | 15.28 | 25.88 | 7.99 |
| 2016 | 6.79 | 9.29 | 4.91 |
| 2015 | 5.36 | 7.46 | 3.05 |
| 2014 | 2.52 | 3.56 | 1.76 |
| 2013 | 2.36 | 3.45 | 1.82 |
| 2012 | 2.5 | 3.08 | 2.02 |
| 2011 | 3.17 | 4.33 | 2.4 |
| 2010 | 5.3 | 7.63 | 3.88 |
| 2009 | 3.74 | 5.08 | 2.48 |
| 2008 | 3.21 | 6.08 | 1.38 |
| 2007 | 4.17 | 6.53 | 1.77 |
| 2006 | 2.66 | 3.99 | 1.49 |
| 2005 | 4.32 | 6.23 | 3.01 |
| 2004 | 6.91 | 11.82 | 4.32 |