| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.69 | 4.59 | 3.34 |
| 2024 | 3.58 | 4.51 | 2.98 |
| 2023 | 4.97 | 6.04 | 4.24 |
| 2022 | 5.89 | 7.84 | 4.96 |
| 2021 | 6 | 8.21 | 5.29 |
| 2020 | 7.05 | 10.2 | 3.97 |
| 2019 | 4.51 | 7.8 | 2.21 |
| 2018 | 3 | 4.04 | 2.09 |
| 2017 | 4.53 | 5.97 | 3.64 |
| 2016 | 4.36 | 5.61 | 2.78 |
| 2015 | 6.25 | 12.33 | 3.07 |
| 2014 | 7.02 | 11.34 | 5.36 |
| 2013 | 5.7 | 7.92 | 3.76 |
| 2012 | 5.01 | 8.54 | 2.53 |
| 2011 | 4.26 | 5.5 | 2.44 |
| 2010 | 5.39 | 6.98 | 3.67 |
| 2009 | 3.79 | 8.24 | 2.38 |
| 2008 | 3.26 | 5.8 | 1.92 |
| 2007 | 2.21 | 3.21 | 1.1 |
| 2006 | 1.19 | 1.49 | 1.02 |
| 2005 | 1.11 | 1.52 | 0.77 |
| 2004 | 1.99 | 2.84 | 1.39 |
| 2003 | 2.32 | 2.88 | 1.99 |
| 2002 | 3.17 | 4.35 | 2.5 |
| 2001 | 5.11 | 6.52 | 3.49 |
| 2000 | 4.51 | 5.38 | 3.28 |