| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.31 | 1.5 | 1.11 |
| 2023 | 1.64 | 2.1 | 1.33 |
| 2022 | 2.2 | 2.83 | 1.9 |
| 2021 | 2.73 | 3.62 | 2.26 |
| 2020 | 3.51 | 4.7 | 2.68 |
| 2019 | 3.29 | 4.14 | 2.87 |
| 2018 | 3.73 | 4.9 | 2.79 |
| 2017 | 5.45 | 6.44 | 4.69 |
| 2016 | 6.19 | 7.29 | 5.53 |
| 2015 | 7.71 | 11.48 | 5.13 |
| 2014 | 5.38 | 9.07 | 3.99 |
| 2013 | 11.51 | 16.47 | 6.12 |
| 2012 | 11.14 | 13.65 | 7.91 |
| 2011 | 8.77 | 12.11 | 6.1 |
| 2010 | 10.71 | 17.5 | 7.28 |
| 2009 | 11.64 | 17.03 | 6.76 |
| 2008 | 9.64 | 16.05 | 5.43 |
| 2007 | 12.68 | 18.14 | 9.22 |
| 2006 | 9.68 | 10.76 | 7.43 |
| 2005 | 8.21 | 10.43 | 5.99 |
| 2004 | 11.31 | 20.71 | 6.28 |