| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.67 | 2.13 | 1.25 |
| 2024 | 1.52 | 2.03 | 1.07 |
| 2023 | 2.1 | 2.89 | 1.68 |
| 2022 | 4.4 | 6.62 | 2.49 |
| 2021 | 4.51 | 7.49 | 2.31 |
| 2020 | 1.6 | 2.39 | 1.29 |
| 2019 | 1.45 | 1.99 | 1.09 |
| 2018 | 2.26 | 4.45 | 1.09 |
| 2017 | 3.18 | 4.86 | 2.45 |
| 2016 | 2.69 | 3.49 | 2.08 |
| 2015 | 4.69 | 5.63 | 3.43 |
| 2014 | 4.26 | 6.1 | 3.4 |
| 2013 | 3.88 | 5.35 | 2.42 |
| 2012 | 2.93 | 3.71 | 1.95 |
| 2011 | 6.43 | 10.19 | 3.25 |
| 2010 | 9.95 | 11.69 | 7.8 |
| 2009 | 5.52 | 9.38 | 2.59 |
| 2008 | 4.41 | 8.46 | 1.58 |
| 2007 | 5.32 | 7.61 | 1.86 |
| 2006 | 1.69 | 2.04 | 1.41 |
| 2005 | 1.81 | 2.7 | 1.44 |
| 2004 | 3.93 | 6.23 | 1.95 |
| 2003 | 5.05 | 5.6 | 2.87 |