| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.75 | 7.07 | 4.71 |
| 2024 | 3.53 | 6.6 | 2.41 |
| 2023 | 3.92 | 4.6 | 3.07 |
| 2022 | 3.48 | 4.74 | 2.25 |
| 2021 | 4.29 | 5.94 | 3.19 |
| 2020 | 3.07 | 4.82 | 2.12 |
| 2019 | 2.05 | 2.75 | 1.42 |
| 2018 | 1.9 | 2.54 | 1.34 |
| 2017 | 3.05 | 4.27 | 2.4 |
| 2016 | 3.9 | 4.79 | 2.96 |
| 2015 | 3.95 | 7.12 | 2.43 |
| 2014 | 2.51 | 3.1 | 2.04 |
| 2013 | 2.45 | 3.44 | 1.79 |
| 2012 | 2.8 | 3.47 | 2.08 |
| 2011 | 4.34 | 5.61 | 2.27 |
| 2010 | 5.22 | 6.67 | 3.99 |
| 2009 | 3.37 | 4.96 | 1.75 |
| 2008 | 3.12 | 5.98 | 1.38 |
| 2007 | 4.47 | 7.35 | 1.96 |
| 2006 | 2.04 | 2.54 | 1.54 |
| 2005 | 1.66 | 2.37 | 1.05 |
| 2004 | 2.97 | 4.37 | 2.16 |
| 2003 | 3.92 | 5.14 | 3 |
| 2002 | 6.44 | 7.43 | 4.4 |