| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 6.19 | 7.51 | 5.14 |
| 2023 | 11.66 | 19.01 | 7.19 |
| 2022 | 12.39 | 18.52 | 8.52 |
| 2021 | 21.47 | 29.25 | 15.57 |
| 2020 | 24.3 | 30.43 | 17.65 |
| 2019 | 16.47 | 20.4 | 10.48 |
| 2018 | 11.95 | 15.6 | 9.37 |
| 2017 | 12.11 | 14.37 | 9.79 |
| 2016 | 15.5 | 18.91 | 11.03 |
| 2015 | 34.12 | 71.64 | 12.67 |
| 2014 | 15.98 | 30.51 | 9.78 |
| 2013 | 9.16 | 12.81 | 6.5 |
| 2012 | 7.62 | 9.17 | 5.71 |
| 2011 | 10.49 | 15.18 | 7.4 |
| 2010 | 14.25 | 17.25 | 11.02 |
| 2009 | 8.73 | 14.26 | 4.91 |
| 2008 | 7.62 | 14.41 | 3.36 |
| 2007 | 10.58 | 17.51 | 4.34 |
| 2006 | 3.21 | 4.74 | 2.15 |
| 2005 | 2.18 | 2.81 | 1.42 |
| 2004 | 3.21 | 6.68 | 1.87 |