| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2 | 2.87 | 1.42 |
| 2024 | 1.24 | 1.75 | 0.98 |
| 2023 | 1.77 | 2.13 | 1.29 |
| 2022 | 1.84 | 2.6 | 1.39 |
| 2021 | 2.16 | 2.75 | 1.75 |
| 2020 | 2.23 | 3.19 | 1.58 |
| 2019 | 2.03 | 2.64 | 1.55 |
| 2018 | 2.39 | 3.61 | 1.54 |
| 2017 | 4.67 | 6.02 | 3.42 |
| 2016 | 6.3 | 7.98 | 5.19 |
| 2015 | 7.66 | 13.13 | 4.09 |
| 2014 | 3.08 | 6.03 | 2.03 |
| 2013 | 2.53 | 3.54 | 1.92 |
| 2012 | 1.97 | 2.51 | 1.52 |
| 2011 | 2.87 | 3.85 | 1.9 |
| 2010 | 2.97 | 4.09 | 1.85 |
| 2009 | 2.97 | 3.94 | 2.26 |
| 2008 | 3.93 | 8.14 | 1.3 |
| 2007 | 5.35 | 7.52 | 2.68 |
| 2006 | 2.9 | 4.67 | 2.02 |
| 2005 | 2.2 | 2.94 | 1.67 |
| 2004 | 3.49 | 6.42 | 1.89 |