| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.47 | 1.53 | 1.34 |
| 2024 | 1.19 | 1.88 | 0.78 |
| 2023 | 1.87 | 3.76 | 1.08 |
| 2022 | 1.85 | 2.5 | 1.39 |
| 2021 | 1.73 | 2.93 | 1.41 |
| 2020 | 5.62 | 21.46 | 1.65 |
| 2019 | 23.27 | 32.46 | 14.31 |
| 2018 | 7.98 | 27.3 | 3.49 |
| 2017 | 11.39 | 19.27 | 4.67 |
| 2016 | 10.05 | 17.41 | 5.26 |
| 2015 | 7.55 | 15.22 | 3.67 |
| 2014 | 3.75 | 6.7 | 2.63 |
| 2013 | 2.43 | 6.54 | 1.32 |
| 2012 | 2.48 | 4.16 | 1.51 |
| 2011 | 2.36 | 2.95 | 1.61 |
| 2010 | 4.58 | 9.12 | 2.5 |
| 2009 | 6.99 | 9.17 | 3.09 |
| 2008 | 6.09 | 13.51 | 2.53 |
| 2007 | 12.21 | 19.39 | 5.37 |
| 2006 | 3.35 | 5.8 | 1.57 |
| 2005 | 2.99 | 4.8 | 1.98 |
| 2004 | 3.76 | 7.17 | 2.18 |