| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.59 | 5.16 | 4.09 |
| 2024 | 4.67 | 6.31 | 3.28 |
| 2023 | 4.01 | 8.72 | 3.15 |
| 2022 | 2.86 | 3.96 | 1.76 |
| 2021 | 1.61 | 2.21 | 1.21 |
| 2020 | 2.19 | 4.2 | 1.48 |
| 2019 | 3.55 | 5.75 | 2.43 |
| 2018 | 5.36 | 11.42 | 2.84 |
| 2017 | 12.6 | 15.33 | 10.29 |
| 2016 | 11.7 | 16.31 | 8.29 |
| 2015 | 10.29 | 16.44 | 5.93 |
| 2014 | 6.96 | 10.78 | 3.67 |
| 2013 | 7 | 9.44 | 5.05 |
| 2012 | 5.5 | 10.74 | 1.82 |
| 2011 | 2.78 | 3.47 | 1.7 |
| 2010 | 3.17 | 3.91 | 2.37 |
| 2009 | 2.34 | 3.02 | 1.25 |
| 2008 | 2.11 | 4.1 | 0.96 |
| 2007 | 2.39 | 3.3 | 1.17 |
| 2006 | 1.19 | 1.69 | 1.01 |
| 2005 | 1.33 | 2.26 | 0.8 |
| 2004 | 2.65 | 3.52 | 1.82 |
| 2003 | 2.98 | 3.31 | 2.08 |
| 2002 | 2.94 | 3.18 | 2.48 |