| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.15 | 4.43 | 4.03 |
| 2024 | 4.35 | 4.93 | 3.75 |
| 2023 | 5.64 | 6.73 | 4.74 |
| 2022 | 6.07 | 8.43 | 5.15 |
| 2021 | 9.43 | 13.63 | 6.63 |
| 2020 | 10.02 | 14.08 | 6.57 |
| 2019 | 6.33 | 8.83 | 4.66 |
| 2018 | 4.61 | 5.58 | 3.86 |
| 2017 | 4.52 | 5.3 | 3.9 |
| 2016 | 4.96 | 5.64 | 4.02 |
| 2015 | 5.96 | 9.75 | 4.15 |
| 2014 | 4.17 | 5.03 | 3.3 |
| 2013 | 3.02 | 4.1 | 1.81 |
| 2012 | 1.55 | 2.06 | 0.92 |
| 2011 | 1.62 | 2.16 | 0.96 |
| 2010 | 1.87 | 2.32 | 1.45 |
| 2009 | 1.69 | 2.17 | 1.13 |
| 2008 | 1.71 | 3.27 | 0.9 |
| 2007 | 3.22 | 4.02 | 2.37 |
| 2006 | 2 | 2.66 | 1.57 |
| 2005 | 1.46 | 1.8 | 0.93 |
| 2004 | 2.06 | 3.75 | 1.23 |