| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.86 | 3.65 | 2.25 |
| 2023 | 3.89 | 4.41 | 3.49 |
| 2022 | 4.17 | 6.99 | 3.02 |
| 2021 | 9.42 | 14.86 | 6.32 |
| 2020 | 12.17 | 19.18 | 7.25 |
| 2019 | 7.31 | 9.11 | 5.4 |
| 2018 | 6.3 | 7.35 | 5.19 |
| 2017 | 6.93 | 8.58 | 5.54 |
| 2016 | 7.87 | 9.77 | 5.97 |
| 2015 | 7.38 | 10.92 | 5.73 |
| 2014 | 5.29 | 6.7 | 4.28 |
| 2013 | 5.47 | 6.22 | 4.68 |
| 2012 | 5.64 | 6.78 | 4.18 |
| 2011 | 8.66 | 13.65 | 5.5 |
| 2010 | 15.03 | 19.62 | 12.63 |
| 2009 | 11.92 | 19.7 | 8.09 |
| 2008 | 12.78 | 18.55 | 6.57 |
| 2007 | 12.08 | 17.98 | 6 |
| 2006 | 3.66 | 6.52 | 2 |
| 2005 | 2.14 | 2.52 | 1.6 |