| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 7.18 | 9.6 | 4.52 |
| 2023 | 12.98 | 17.48 | 8.44 |
| 2022 | 14.85 | 19.16 | 10.48 |
| 2021 | 19.6 | 28.85 | 13.06 |
| 2020 | 11.87 | 20.78 | 6.38 |
| 2019 | 7.66 | 10.37 | 4.51 |
| 2018 | 7.34 | 11.08 | 4.34 |
| 2017 | 8.17 | 10.66 | 5.91 |
| 2016 | 5.76 | 6.54 | 4.48 |
| 2015 | 5.71 | 8.36 | 3.62 |
| 2014 | 2.74 | 4.24 | 1.95 |
| 2013 | 3.09 | 4.81 | 2.3 |
| 2012 | 6.1 | 8.76 | 3.98 |
| 2011 | 10.25 | 13.29 | 7.1 |
| 2010 | 10.92 | 13.96 | 8.47 |
| 2009 | 9.68 | 14.11 | 6.05 |
| 2008 | 13.93 | 26.07 | 5.88 |
| 2007 | 19.34 | 28.88 | 11.57 |
| 2006 | 6.12 | 12.83 | 2.44 |
| 2005 | 2.28 | 3.34 | 1.35 |
| 2004 | 2.09 | 3.93 | 1.39 |