| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.31 | 2.37 | 2.19 |
| 2024 | 2.41 | 2.99 | 1.97 |
| 2023 | 3.16 | 4.4 | 2.36 |
| 2022 | 3.95 | 4.96 | 3.06 |
| 2021 | 3.08 | 3.98 | 2.51 |
| 2020 | 3.67 | 4.66 | 2.88 |
| 2019 | 3.02 | 3.76 | 2.03 |
| 2018 | 3.03 | 5.05 | 1.77 |
| 2017 | 5.73 | 6.64 | 4.7 |
| 2016 | 5.84 | 7.95 | 3.78 |
| 2015 | 7 | 12.95 | 4.39 |
| 2014 | 6.31 | 8.38 | 5.27 |
| 2013 | 7.01 | 9.59 | 4.67 |
| 2012 | 4.72 | 5.63 | 3.86 |
| 2011 | 6.52 | 8.59 | 4.22 |
| 2010 | 6.71 | 9.96 | 4.59 |
| 2009 | 3.73 | 4.85 | 2.39 |
| 2008 | 4.06 | 6.87 | 1.84 |
| 2007 | 4.56 | 6.76 | 2.06 |
| 2006 | 2.12 | 2.5 | 1.71 |
| 2005 | 1.99 | 2.66 | 1.55 |
| 2004 | 3.03 | 4.25 | 2.32 |
| 2003 | 3.76 | 4.6 | 2.83 |
| 2002 | 6.01 | 6.91 | 4.57 |
| 2001 | 7.42 | 8.88 | 4.95 |
| 2000 | 6.81 | 9.29 | 5.33 |