| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3.03 | 4.31 | 2.12 |
| 2023 | 5.28 | 7.56 | 4.05 |
| 2022 | 6.65 | 10.58 | 5.09 |
| 2021 | 17.11 | 24.84 | 9.84 |
| 2020 | 18.99 | 28.05 | 13.4 |
| 2019 | 9.32 | 13.61 | 5.11 |
| 2018 | 7.46 | 9.98 | 4.93 |
| 2017 | 7.32 | 9.59 | 6.18 |
| 2016 | 6.31 | 7.41 | 4.51 |
| 2015 | 6.77 | 10.21 | 4.41 |
| 2014 | 6.42 | 8.48 | 5.12 |
| 2013 | 7.01 | 8.37 | 4.76 |
| 2012 | 4.26 | 5.41 | 3.15 |
| 2011 | 5.24 | 7.18 | 3.67 |
| 2010 | 5.51 | 8.38 | 3.33 |
| 2009 | 2.87 | 3.95 | 1.7 |
| 2008 | 1.77 | 2.93 | 0.94 |
| 2007 | 2.85 | 4.65 | 1.5 |
| 2006 | 1.27 | 1.68 | 0.76 |
| 2005 | 1.33 | 2.11 | 0.88 |
| 2004 | 1.19 | 1.93 | 0.82 |