| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.85 | 5.73 | 2.36 |
| 2024 | 1.93 | 3.13 | 1.4 |
| 2023 | 1.95 | 2.74 | 1.49 |
| 2022 | 1.65 | 2.79 | 1.27 |
| 2021 | 2.23 | 2.7 | 1.89 |
| 2020 | 3.48 | 4.76 | 2.51 |
| 2019 | 3.46 | 5.25 | 1.63 |
| 2018 | 2.38 | 3.73 | 1.43 |
| 2017 | 4.45 | 6.75 | 2.92 |
| 2016 | 9.52 | 16.13 | 6.56 |
| 2015 | 14.15 | 28.53 | 5.29 |
| 2014 | 4.09 | 7.91 | 1.94 |
| 2013 | 1.64 | 2.6 | 0.92 |
| 2012 | 0.93 | 1.15 | 0.77 |
| 2011 | 1.14 | 1.37 | 0.93 |
| 2010 | 1.36 | 1.87 | 0.92 |
| 2009 | 1.33 | 1.86 | 0.77 |
| 2008 | 1.17 | 1.97 | 0.56 |
| 2007 | 1.91 | 3.01 | 1.24 |
| 2006 | 1.25 | 1.92 | 0.68 |
| 2005 | 1.09 | 1.51 | 0.84 |
| 2004 | 2.83 | 6.16 | 1.43 |