| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.34 | 2.92 | 1.73 |
| 2024 | 1.37 | 3.29 | 0.93 |
| 2023 | 1.66 | 2.03 | 1.3 |
| 2022 | 1.42 | 1.95 | 1.1 |
| 2021 | 1.64 | 2.02 | 1.41 |
| 2020 | 2.69 | 3.62 | 1.89 |
| 2019 | 2.26 | 3.12 | 1.22 |
| 2018 | 2.01 | 2.98 | 1.2 |
| 2017 | 2.23 | 2.63 | 1.89 |
| 2016 | 4.16 | 6.54 | 2.53 |
| 2015 | 8.2 | 13.16 | 3.84 |
| 2014 | 3.66 | 7.96 | 1.72 |
| 2013 | 1.91 | 2.28 | 1.62 |
| 2012 | 2.22 | 3 | 1.52 |
| 2011 | 4.34 | 5.93 | 2.55 |
| 2010 | 5.2 | 7.36 | 3.57 |
| 2009 | 4.01 | 5.29 | 3.08 |
| 2008 | 4.15 | 8.74 | 1.91 |
| 2007 | 8.55 | 11.18 | 5.41 |
| 2006 | 5.16 | 7.4 | 3.87 |
| 2005 | 3.37 | 4.75 | 2.15 |