| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.03 | 4.65 | 3.63 |
| 2024 | 3.98 | 5.63 | 3.34 |
| 2023 | 3.77 | 4.98 | 3.12 |
| 2022 | 3.22 | 4.13 | 2.52 |
| 2021 | 0.59 | 0.68 | 0.47 |
| 2020 | 0.68 | 1.19 | 0.48 |
| 2019 | 0.91 | 1.72 | 0.45 |
| 2018 | 3.04 | 4.15 | 1.32 |
| 2017 | 3.35 | 3.8 | 2.97 |
| 2016 | 3.41 | 4.28 | 2.85 |
| 2015 | 4.31 | 6.67 | 2.74 |
| 2014 | 2.84 | 3.7 | 2.42 |
| 2013 | 3.7 | 4.43 | 2.91 |
| 2012 | 3.27 | 3.81 | 2.7 |
| 2011 | 4.61 | 8.06 | 2.62 |
| 2010 | 5.76 | 8.46 | 4.19 |
| 2009 | 4.02 | 5.33 | 2.62 |
| 2008 | 2.82 | 4.11 | 1.73 |
| 2007 | 4.24 | 6.36 | 2.2 |
| 2006 | 2.54 | 4.25 | 1.76 |
| 2005 | 2.1 | 2.57 | 1.61 |
| 2004 | 3.26 | 4.63 | 2.2 |
| 2003 | 4.48 | 5.97 | 2.91 |
| 2002 | 5.33 | 5.84 | 4.74 |