| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.11 | 4.85 | 3.56 |
| 2024 | 3.53 | 5.82 | 2.51 |
| 2023 | 3.29 | 4.04 | 2.87 |
| 2022 | 3.5 | 6.13 | 2.67 |
| 2021 | 3.07 | 5.67 | 2.35 |
| 2020 | 4.08 | 6.3 | 2.15 |
| 2019 | 3.73 | 5.67 | 2.55 |
| 2018 | 5.15 | 6.29 | 3.24 |
| 2017 | 4.74 | 6.15 | 3.9 |
| 2016 | 5.61 | 7.16 | 4.66 |
| 2015 | 5.75 | 9.51 | 2.48 |
| 2014 | 2.29 | 2.66 | 1.93 |
| 2013 | 2.97 | 3.96 | 2.29 |
| 2012 | 3.37 | 4.58 | 2.34 |
| 2011 | 7.12 | 12.12 | 3.23 |
| 2010 | 5.01 | 7 | 3.32 |
| 2009 | 4.55 | 6.18 | 2.12 |
| 2008 | 3.54 | 7.88 | 1.25 |
| 2007 | 5.08 | 7.3 | 2.6 |
| 2006 | 2.23 | 3.69 | 1 |
| 2005 | 1.18 | 2.05 | 0.67 |
| 2004 | 2.14 | 2.96 | 1.6 |
| 2003 | 2.26 | 2.91 | 1.77 |
| 2002 | 3.35 | 3.85 | 2.42 |
| 2001 | 4.52 | 5.25 | 3.73 |