| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.05 | 2.43 | 1.56 |
| 2023 | 2.55 | 4.09 | 1.62 |
| 2022 | 2.34 | 3.67 | 1.54 |
| 2021 | 13.36 | 24.08 | 2.88 |
| 2020 | 17.65 | 24.41 | 13.63 |
| 2019 | 6.7 | 14.46 | 4.29 |
| 2018 | 8.91 | 13.21 | 4.28 |
| 2017 | 12.53 | 15.74 | 10.17 |
| 2016 | 7.13 | 11.39 | 3.25 |
| 2015 | 5.04 | 7.7 | 2.98 |
| 2014 | 3.66 | 5.18 | 2.51 |
| 2013 | 5.64 | 7.12 | 3.81 |
| 2012 | 7.93 | 11.14 | 5.48 |
| 2011 | 9.52 | 12.5 | 5.81 |
| 2010 | 7.27 | 14.42 | 3.95 |
| 2009 | 11.42 | 14.11 | 8.3 |
| 2008 | 10.61 | 18.74 | 6.81 |
| 2007 | 14.91 | 23.03 | 6.17 |
| 2006 | 5.98 | 7.82 | 4.23 |
| 2005 | 2.93 | 4.83 | 1.17 |
| 2004 | 2.24 | 3.61 | 1.48 |