| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.16 | 2.29 | 1.94 |
| 2024 | 2.08 | 3 | 1.6 |
| 2023 | 2.33 | 2.71 | 2.07 |
| 2022 | 2.22 | 2.74 | 1.84 |
| 2021 | 3.26 | 4.75 | 2.32 |
| 2020 | 5.06 | 8.84 | 2.57 |
| 2019 | 18.97 | 35.07 | 3.3 |
| 2018 | 26.04 | 48.97 | 2.76 |
| 2017 | 4.66 | 7.91 | 3.27 |
| 2016 | 8.1 | 13.42 | 2.11 |
| 2015 | 2.88 | 5.24 | 1.74 |
| 2014 | 0.93 | 2.27 | 0.73 |
| 2013 | 0.81 | 0.98 | 0.66 |
| 2012 | 1.11 | 1.54 | 0.76 |
| 2011 | 2.1 | 2.88 | 1.33 |
| 2010 | 3.09 | 3.73 | 2.54 |
| 2009 | 2.45 | 3.74 | 1.45 |
| 2008 | 2.62 | 4.48 | 1.19 |
| 2007 | 3.93 | 5.31 | 2.31 |
| 2006 | 1.48 | 2.45 | 0.93 |
| 2005 | 1 | 1.43 | 0.54 |
| 2004 | 0.89 | 1.61 | 0.63 |